75000 - Document - Document and Entity Information
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75010 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS
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75020 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical)
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75030 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (unaudited)
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75040 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (unaudited) 2
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75050 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (Parenthetical) (Unaudited)
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75060 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY, MEMBERS' DEFICIT AND MEZZANINE EQUITY (Unaudited)
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75070 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
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995455 - Disclosure - ORGANIZATION AND NATURE OF BUSINESS
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995465 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RECENT ACCOUNTING PRONOUNCEMENTS
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995475 - Disclosure - REVENUE AND GRANT INCOME RECOGNITION
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995485 - Disclosure - PROPERTY AND EQUIPMENT, NET
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995495 - Disclosure - GOVERNMENT GRANTS FOR PROPERTY AND EQUIPMENT
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995505 - Disclosure - ACCRUED LIABILITIES
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995515 - Disclosure - DEBT
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995525 - Disclosure - PROFIT SHARING PLAN
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995535 - Disclosure - INCOME TAX
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995545 - Disclosure - STOCKHOLDERS' EQUITY AND MEZZANINE EQUITY
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995555 - Disclosure - EQUITY-BASED COMPENSATION
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995565 - Disclosure - NET LOSS PER SHARE
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995575 - Disclosure - FAIR VALUE MEASUREMENTS
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995585 - Disclosure - RELATED PARTY TRANSACTIONS
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995595 - Disclosure - COMMITMENTS AND CONTINGENCIES
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995605 - Disclosure - SUPPLEMENTAL CASH FLOW INFORMATION
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995615 - Disclosure - SEGMENTS
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995625 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RECENT ACCOUNTING PRONOUNCEMENTS (Policies)
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995635 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RECENT ACCOUNTING PRONOUNCEMENTS (Tables)
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995645 - Disclosure - REVENUE AND GRANT INCOME RECOGNITION (Tables)
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995655 - Disclosure - PROPERTY AND EQUIPMENT, NET (Tables)
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995665 - Disclosure - ACCRUED LIABILITIES (Tables)
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995675 - Disclosure - STOCKHOLDERS' EQUITY AND MEZZANINE EQUITY (Tables)
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995685 - Disclosure - EQUITY-BASED COMPENSATION (Tables)
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995695 - Disclosure - NET LOSS PER SHARE (Table)
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995705 - Disclosure - FAIR VALUE MEASUREMENTS (Tables)
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995715 - Disclosure - RELATED PARTY TRANSACTIONS (Tables)
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995725 - Disclosure - COMMITMENTS AND CONTINGENCIES (Tables)
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995735 - Disclosure - SUPPLEMENTAL CASH FLOW INFORMATION (Tables)
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995745 - Disclosure - ORGANIZATION AND NATURE OF BUSINESS - Additional Information (Details)
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995755 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RECENT ACCOUNTING PRONOUNCEMENTS - Non-controlling Interest (Additional Information) (Details)
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995765 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RECENT ACCOUNTING PRONOUNCEMENTS - Deposits For Long Lead Materials And Prepaid Costs (Additional Information) (Details)
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995765 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RECENT ACCOUNTING PRONOUNCEMENTS - Deposits For Long Lead Materials And Prepaid Costs (Additional Information) (Details) [Default]
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995775 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RECENT ACCOUNTING PRONOUNCEMENTS - Deferred Transaction Costs (Additional Information) (Details)
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995785 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RECENT ACCOUNTING PRONOUNCEMENTS - Schedule of Balance Receivable Related to Services Revenue and Government Grants (Details)
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995795 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RECENT ACCOUNTING PRONOUNCEMENTS - Schedule of Cash and Cash Equivalents and Restricted Cash (Details)
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995805 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RECENT ACCOUNTING PRONOUNCEMENTS - Schedule of Other Income and Expense (Details)
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995815 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RECENT ACCOUNTING PRONOUNCEMENTS - Schedule of Accumulated Other Comprehensive Income Loss (Details)
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995825 - Disclosure - REVENUE AND GRANT INCOME RECOGNITION - Additional Information (Details)
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995835 - Disclosure - REVENUE AND GRANT INCOME RECOGNITION - Schedule of Revenues and Grant Income by Customer Type (Details)
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995845 - Disclosure - REVENUE AND GRANT INCOME RECOGNITION - Schedule of Revenues and Grant Income by Geographic Location (Details)
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995855 - Disclosure - REVENUE AND GRANT INCOME RECOGNITION - Schedule of Balances Recorded within Deferred Revenue (Details)
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995855 - Disclosure - REVENUE AND GRANT INCOME RECOGNITION - Schedule of Balances Recorded within Deferred Revenue (Details) [Default]
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995865 - Disclosure - REVENUE AND GRANT INCOME RECOGNITION - Schedule of Balances Recorded within Deferred Revenue (Parenthetical) (Details)
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995875 - Disclosure - REVENUE AND GRANT INCOME RECOGNITION - Summary of Unbilled Receivables and Contract Assets (Details)
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995875 - Disclosure - REVENUE AND GRANT INCOME RECOGNITION - Summary of Unbilled Receivables and Contract Assets (Details) [Default]
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995885 - Disclosure - PROPERTY AND EQUIPMENT, NET - Schedule of Property and Equipment, Net (Details)
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995895 - Disclosure - GOVERNMENT GRANTS FOR PROPERTY AND EQUIPMENT - Additional Information (Details)
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995905 - Disclosure - ACCRUED LIABILITIES - Schedule of components of accrued liabilities (Details)
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995915 - Disclosure - DEBT - Additional Information (Details)
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995925 - Disclosure - PROFIT SHARING PLAN - Additional Information (Details)
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995935 - Disclosure - INCOME TAX - Additional Information (Details)
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995945 - Disclosure - STOCKHOLDERS' EQUITY AND MEZZANINE EQUITY - Additional Information (Details)
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995955 - Disclosure - STOCKHOLDERS' EQUITY AND MEZZANINE EQUITY - Schedule of Common Units and Preferred Units Outstanding by Unit Class and Carrying Value (Details)
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995965 - Disclosure - EQUITY-BASED COMPENSATION - Additional Information (Details)
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995975 - Disclosure - EQUITY-BASED COMPENSATION - Summary of Equity based and Unite based compensation expense (Details)
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995975 - Disclosure - EQUITY-BASED COMPENSATION - Summary of Equity based and Unite based compensation expense (Details) [Default]
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995985 - Disclosure - EQUITY-BASED COMPENSATION - Summary of Stock Award Activities and Changes - Stock Options (Details)
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995995 - Disclosure - EQUITY-BASED COMPENSATION - Summary of Fair Value of Options Using Black-Scholes Option Pricing Model (Details)
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996005 - Disclosure - EQUITY-BASED COMPENSATION - Summary of Stock Award Activities and Changes - Restricted Stock Awards and Restricted Stock Units (Details)
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996015 - Disclosure - NET LOSS PER SHARE - Additional Information (Details)
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996025 - Disclosure - NET LOSS PER SHARE - Schedule of Reconciliation of Numerator and Denominator Used in Calculation of Basic and Diluted Net Loss per Share of Class A Common Stock (Details)
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996035 - Disclosure - FAIR VALUE MEASUREMENTS - Schedule of Rollforward of Level 3 Measurements (Details)
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996045 - Disclosure - FAIR VALUE MEASUREMENTS - Schedule of Valuation Techniques and Significant Unobservable Inputs (Details)
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996055 - Disclosure - FAIR VALUE MEASUREMENTS - Additional Information (Details)
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996065 - Disclosure - FAIR VALUE MEASUREMENTS - Schedule of Estimated Fair Values of Financial Instruments (Details)
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996075 - Disclosure - FAIR VALUE MEASUREMENTS - Schedule of Company's Financial Instruments of Carrying Values and Fair Values (Details)
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996085 - Disclosure - FAIR VALUE MEASUREMENTS - Schedule of Company's Financial Instruments of Carrying Values and Fair Values (Details) 2
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996095 - Disclosure - FAIR VALUE MEASUREMENTS - Schedule of Amortized Cost and Estimated Fair Value of Held to Maturity Securities by Contractual Maturity (Details)
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996105 - Disclosure - RELATED PARTY TRANSACTIONS - Additional Information (Details)
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996115 - Disclosure - RELATED PARTY TRANSACTIONS - Summary of Related Party Revenues That Are Reflected Within Services Revenue (Details)
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996125 - Disclosure - RELATED PARTY TRANSACTIONS - Summary of the Expenses with Related Parties (Details)
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996135 - Disclosure - RELATED PARTY TRANSACTIONS - Summary of Balances Within Due from and Due to Related Parties and Long-term Deferred Revenue (Details)
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996145 - Disclosure - RELATED PARTY TRANSACTIONS - Summary of Balances Within Due from and Due to Related Parties and Long-term Deferred Revenue (Parenthetical) (Details)
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996155 - Disclosure - COMMITMENTS AND CONTINGENCIES - Additional Information (Details)
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996165 - Disclosure - COMMITMENTS AND CONTINGENCIES - Commitments to Purchase Goods or Services Related to Supply Agreements (Details)
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996175 - Disclosure - SUPPLEMENTAL CASH FLOW INFORMATION - Schedule of Non-Cash Investing and Financing Activities (Details)
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996185 - Disclosure - SEGMENTS - Additional Information (Details)
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Cash Provided by (Used in) Financing Activity, Continuing Operation [Abstract]
Cash flows from financing activities:
Line of Credit Facility [Line Items]
Related Party Transaction [Table]
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Foreign currency translation adjustment
Expected term (years)
Warrants and Rights Outstanding, Term
Series A A-1 B C C-1 and D Redeemable Preferred Stock [Member]
Series A A-1 B C C-1 and D redeemable preferred stock member.
SeriesA A-1 B C C-1 And D Redeemable Preferred Stock [Member]
Debt Conversion, Name [Domain]
Government Assistance, Income, Increase (Decrease)
Government Assistance, Income, Increase (Decrease), Total
Grant income
Common Stock, Capital Shares Reserved for Future Issuance
Share issued for future events
Schedule of Accrued Liabilities [Table Text Block]
Schedule of components of accrued liabilities
Preferred Stock, Shares Issued
Preferred stock, shares issued
Debt Disclosure [Text Block]
DEBT
Non-controlling Interest
Subsidiary, Ownership Percentage, Noncontrolling Owner
Antidilutive Securities Excluded From Computation Of Earnings Per Share Reserved For Future Issuance
Antidilutive securities excluded from computation of earnings per share reserved for future issuance.
Share issued for future events
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total
Unrecognized compensation cost
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block]
Schedule of Estimated Fair Values of Financial Instruments
Temporary Equity, Shares Authorized
Total Units, Authorized
Long-Term Line of Credit
Long-Term Line of Credit, Total
Debt outstanding
Share-Based Payment Arrangement, Plan Modification, Incremental Cost
Incremental compensation cost
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested, Weighted Average Grant Date Fair Value
Weighted average grant-date fair value, options vested
Effect of the Reorganization Transactions, Shares
Temporary Equity Effect of the Reorganization Transactions Shares
Temporary equity effect of the reorganization transactions shares.
Weighted Average Number of Shares Outstanding, Diluted
Weighted Average Number of Shares Outstanding, Diluted, Total
Weighted-average shares of Class A common stock outstanding - diluted
Investor [Member]
Investor
Due from related parties
Other Receivables, Net, Current
Other Receivables, Net, Current, Total
Effect of Reorganization Transactions Shares
Effect of reorganization transactions shares.
Effect of the Reorganization Transactions, Shares
Long-term deferred revenue with related parties
Contract with Customer, Liability, Noncurrent
Department of War [Member]
Department of War.
Department of War
Minimum [Member]
Minimum
Dow Inc [Member]
Dow Inc.
DOW
Notes Payable [Member]
Notes payable member.
Notes Payable [Member]
Partners' Capital, Master Limited Partnership, Preferred Unit [Table]
Preferred Stock, Shares Outstanding
Preferred Stock, Shares Outstanding, Ending Balance
Preferred Stock, Shares Outstanding, Beginning Balance
Preferred stock, shares outstanding
Temporory Equity Component [Domain]
Temporory equity component
Contract With Customer Reserve
Contract with customer reserve.
Contract-related reserves
2024 Warrant
Two Thousand And Twenty Four warrant [Member]
Two Thousand And Twenty Four warrant.
Common Stock, Shares, Issued
Common stock, shares issued
Recorded Unconditional Purchase Obligation, to be Paid, Year Three
2029
Debt Instrument, Face Amount
Income Tax Expense (Benefit)
Income Tax Expense (Benefit), Total
Income tax expense and benefit
Temporary Equity Component [Domain]
Temporary Equity Component.
Property, Plant and Equipment [Member]
Property and Equipment, Net
Recorded Unconditional Purchase Obligation, Category [Domain]
Related Party Transaction [Line Items]
Restricted Stock Units (RSUs) [Member]
Restricted Stock Units
December Two Thousand Twenty Two Warrants [Member]
December Two Thousand Twenty Two Warrants [Member]
December 2022 Warrants
Warrants to purchase shares of common stock
Class of Warrant or Right, Number of Securities Called by Warrants or Rights
Preferred units authorized
Government Assistance, Type [Domain]
Stock Issued During Period, Value, Conversion of Convertible Securities
Conversion of Warrant into Units
Line of Credit Facility, Maximum Borrowing Capacity
Maximum borrowing capacity
Proceeds from Sale and Maturity of Held-to-Maturity Securities
Proceeds from Sale and Maturity of Held-to-Maturity Securities, Total
Proceeds from maturities on investments
Cost of Product and Service Sold
Cost of Product and Service Sold, Total
Subcontracting services
Direct costs
Property, Plant, and Equipment, Excluding Lessor Asset under Operating Lease, before Accumulated Depreciation
Property and equipment at cost
Stock Issued During Period Shares Conversion of Profits Interests Units
Stock issued during period shares conversion of profits interests units.
Conversion of profits interests units, Shares
Property, Plant, and Equipment [Text Block]
PROPERTY AND EQUIPMENT, NET
Amortized Cost Basis, Due after one year through five years
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year One through Five
Reimbursement of capital expenditures under government grant
Reimbursement of capital expenditures under government grant
Reimbursement of capital expenditures under government grant
Other Comprehensive Income (Loss), before Tax [Abstract]
Other comprehensive income (loss)
C-2 Notes [Member]
C-2 Notes [Member]
C-2 Notes
Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation
Net effect of exchange rate
Nonoperating Income (Expense)
Total other income (expense), net
Increase Decrease In Long Term Deferred Revenue With Related Parties
Increase decrease in long term deferred revenue with related parties.
Long-term deferred revenue with related parties
Share-Based Compensation Arrangement by Share-Based Payment Award, Percentage of Outstanding Stock Maximum
Percentage of aggregate number of common stock share outstanding
Income Statement [Abstract]
Interest Paid, Including Capitalized Interest, Operating and Investing Activities
Interest Paid, Including Capitalized Interest, Operating and Investing Activities, Total
Interest payments
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period
Number of restricted stock forfeited
Accrued Deferred Transaction cost
Accrued deferred transaction cost.
Accrued deferred transaction costs
Class A and Class B Common Stock [Member]
Class A and Class B common stock .
Class A and Class B common stock
Department of War
United States Department of War [Member]
United states department of war.
Debt Instrument, Measurement Input
Fair value measurement input
Related and Nonrelated Parties [Domain]
Earnings Per Share, Basic
Earnings Per Share, Basic, Total
Net loss attributable to Class A common stock per share - basic
Commercial
Commercial [Member]
Commercial [Member]
Document Period End Date
Document Information [Table]
Accounts Payable and Accrued Liabilities Disclosure [Text Block]
ACCRUED LIABILITIES
Temporary Equity Stock Issued During Period Shares Conversion of Profits Interests Units
Temporary equity stock issued during period shares conversion of profits interests units.
Conversion of profits interests units, Shares
Series B Preferred Stock [Member]
Series B Redeemable Convertible Preferred Units [Member]
Series B Preferred Stock
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five
Fair Value, Due after one year through five years
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period
Grant period for stock
Common Stock, Shares Authorized
Common stock, shares authorized
Statement of Stockholders' Equity [Abstract]
United States Department of Energy [Member]
United States Department of Energy [Member]
DOE
Deposits Assets, Current
Deposits assets, current
Warrants and Rights Outstanding, Measurement Input
Fair value measurement input
Prepaid Expense and Other Assets, Current
Prepaid and other current assets
Debt Conversion Description [Axis]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss)
Change in fair value attributable to instrument-specific credit risk recognized in Other comprehensive income
United States Department of Defense [Member]
United States Department of Defense [Member]
DOD
Units vested
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value
Percentage of Total Revenue and Grant Income
Percentage of total revenue and grant income.
Percentage of total revenue and grant income
Other Comprehensive Income (Loss), Net of Tax
Other Comprehensive Income (Loss), Net of Tax, Total
Other comprehensive income (loss)
Debt Instrument, Interest Rate, Stated Percentage
Annual interest rate
Costs and Expenses
Total operating expenses
Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table]
Common Class B [Member]
Class B Common Units
Class B common stock
Disaggregation of Revenue [Table]
Supplemental Cash Flow Elements [Abstract]
Subsequent to the IPO [Member]
Subsequent to the IPO.
Subsequent to the IPO
Assets
Total assets
Title of 12(b) Security
Class Of Warrant Or Right Issued
Class of warrant or right issued.
Number of warrants issued (in units)
Preferred Stock, Value, Issued
Preferred Stock, Value, Issued, Total
Preferred Stock: $0.0001 par value per share; 10.0 million shares authorized, no shares issued and outstanding as of June 30, 2026; no shares authorized, issued, and outstanding as of December 31, 2025
Issuance Date Fair Value Of Warrant
Issuance Date Fair Value Of Warrant
Issuance date fair value of warrant
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number
Share outstanding
Number of restricted stock outstanding as of January 1, 2026
Number of restricted stock outstanding as of June 30, 2026
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Nonvested Options Forfeited, Weighted Average Grant Date Fair Value
Weighted average grant-date fair value, options forfeited
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross
Equity Awards granted
Number of options granted
Effective income tax rate
Effective Income Tax Rate Reconciliation, Percent
Effective Income Tax Rate Reconciliation, Percent, Total
Schedule of Related Party Revenues
Related Party Revenue [Table Text Block]
Related party revenue.
June Two Thousand Twenty Two Warrants [Member]
June Two Thousand Twenty Two Warrants [Member]
June 2022 Warrants
Other Receivable, after Allowance for Credit Loss, Current, Related Party [Extensible Enumeration]
Government Grant Reimbursement Receivable for Purchase of Property and Equipment
Government grant reimbursement receivable for purchase of property and equipment
Government grant reimbursement receivable for purchase of property and equipment
Recorded Unconditional Purchase Obligation
Unconditional Purchase Obligation, Total
Valuation Technique, Option Pricing Model [Member]
Valuation Technique Option Pricing Model
Grant date fair value of warrant
Warrants Not Settleable in Cash, Fair Value Disclosure
Location, Statement of Financial Position, Balance [Axis]
Conversion of C2 Notes Into Series C Preferred Unit [Member]
Conversion of c2 notes into series c preferred unit member.
Conversion Of C2 Notes Into Series C Preferred Unit
Discount for lack of marketability
Measurement Input, Discount for Lack of Marketability [Member]
Cash and Cash Equivalents [Domain]
Contract with Customer, Asset, after Allowance for Credit Loss, Current
Contract assets
Contract assets - total
Net loss subsequent to Reorganization Transactions
Net Loss Attributable to XERC Prior to IPO and Non Controlling Interests Subsequent to IPO Including Non controlling Interests Subsequent Transactions
Net loss attributable to XERC prior to IPO and non controlling interests subsequent to IPO including non controlling interests subsequent transactions.
Preferred Capital Units [ Member]
Preferred capital units member.
Preferred Capital Units
Disaggregation of Revenue [Table Text Block]
Schedule of Revenues and Grant Income by Customer Type
Increase (Decrease) in Operating Lease Liability
Operating lease liabilities
OCI, Market Risk Benefit, Instrument-Specific Credit Risk, Gain (Loss), after Adjustments and Tax, Parent
OCI, Market Risk Benefit, Instrument-Specific Credit Risk, Gain (Loss), after Adjustments and Tax, Parent, Total
Changes in fair value of liabilities under fair value option attributable to changes in instrument-specific credit risk
Total mezzanine equity
Equity, Attributable to Parent
Ending balance
Beginning balance
Accumulated other comprehensive income (loss)
Total equity (deficit) attributable to stockholders and members
Total equity (deficit) attributable to X-Energy, Inc.
Valuation Approach and Technique [Domain]
Recorded Unconditional Purchase Obligation, to be Paid, Remainder of Fiscal Year
2026
Entity Address, Address Line Two
Other long-term assets
Other Assets, Noncurrent
Income Tax Disclosure [Text Block]
INCOME TAX
Fair Value, by Balance Sheet Grouping [Table Text Block]
Schedule of Company's Financial Instruments of Carrying Values and Fair Values
Earnings Per Share [Text Block]
NET LOSS PER SHARE
Fixed-Price Contract [Member]
Fixed fee
Estimate of Fair Value Measurement [Member]
Fair Value
Gross Unrealized Gains
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain
Number of reportable segments
Number of Reportable Segments
Temporary Equity Component [Axis]
Temporary Equity Component.
Basis of Accounting, Policy [Policy Text Block]
Basis of Presentation
Equity
Equity [Member]
Long-Term Debt
Long-Term Debt, Total
Borrowings
Credit Facility [Axis]
Temporary Equity Number of Unit Based Compensation Shares
Temporary equity Number of unit based compensation shares.
Unit-based compensation, Shares
Stock, Class of Stock [Table]
Restricted Stock Awards
Restricted Stock [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value
Weighted average grant-date fair value, vested
Mark-to-market loss on C-2 Notes
Mark-to-market loss on C-2 Notes.
Mark-to-market loss on C-2 Notes
Geographical [Domain]
Increase (Decrease) in Due from Related Parties
Increase (Decrease) in Due from Related Parties, Total
Due from related parties
Due From Related Parties
Due from related parties
Statistical Measurement [Axis]
Money Market Funds [Member]
Money market fund
Entity Interactive Data Current
Temporary Equity, Stock Issued During Period, Value, New Issues
Issuance and Conversion of Series C-1 Preferred Units (including Net Issuance Costs and Warrant Conversions)
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum
Equity volatility, Maximum
Common stock value
Common Stock, Value, Issued
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Schedule of Reconciliation of Numerator and Denominator Used in Calculation of Basic and Diluted Net Loss per Share of Class A Common Stock
RSA And RSU [Member]
RSA And RSU.
RSAs and RSU
Liabilities
Total liabilities
Gain (Loss), Foreign Currency Transaction, before Tax
Gain (Loss), Foreign Currency Transaction, before Tax, Total
Foreign currency transaction gain (loss)
Ownership [Domain]
Summary Of Significant Accounting Policy [Line Items]
Summary Of Significant Accounting Policy [Line Items]
Accrued Liabilities and Deferred Revenue Current
Accrued liabilities and deferred revenue current.
Total accrued liabilities
Accrued liabilities
Product and Service [Axis]
Accumulated deficit
Retained Earnings (Accumulated Deficit)
Retained Earnings (Accumulated Deficit), Total
Fair Value, Inputs, Level 3 [Member]
Level 3
Other income (expense)
Other Nonoperating Income (Expense) [Abstract]
Cash equivalents
Cash and Cash Equivalents, Fair Value Disclosure
Operating Expenses
Total operating expenses
Less: Net loss attributable to XERC prior to the IPO
Net Loss Attributable To XERC Prior To The IPO
Net loss attributable to xerc prior to the ipo
Share price
Share Price
Fair Value, by Balance Sheet Grouping [Table]
Commercial Paper and Certificates of Deposit [Member]
Commercial paper and certificates of deposit.
Commercial Paper and Certificates of Deposit [Member]
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss
Net carrying amount
Net Carrying Amount
Disaggregation of Revenue [Line Items]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]
ORGANIZATION AND NATURE OF BUSINESS
Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract]
Changes in operating assets and liabilities:
Shares Issued, Price Per Share
Per share price
Other Liability, Current, Related Party [Extensible Enumeration]
Stock Issued During Period, Shares, New Issues
Issuance of Class A common stock in IPO, net of issuance costs, shares
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest, Total
Less: Comprehensive loss attributable to non-controlling interests
Class of Warrant or Right, Outstanding
Class of warrant or right, outstanding
IPO [Member]
IPO
IPO Options
Increase Decrease in Deferred Revenue
Deferred Revenue, Period Increase (Decrease)
Accumulated other comprehensive loss attributable to non-controlling interest
AOCI Attributable to Noncontrolling Interest [Member]
Vested IPO Options [Member]
Vested IPO Options.
Vested IPO Options
X Energy class A common Stock
X Energy Class A Common Stock [Member]
X Energy class A common stock.
Risk-free rate, Maximum
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum
Temporary Equity, Carrying Amount, Attributable to Parent
Beginning Balance
Ending Balance
Mezzanine equity
Total Units, Amount
Recapitalization cost
Fair value of warrants
Derivative Liability
Derivative Liability, Total
Related Party Transactions [Abstract]
Daniel Gross [Member]
Daniel Gross.
Daniel Gross
Long-Lived Asset, Class [Axis]
2026 Equity Incentive Plan
2026 Equity Incentive Plan [Member]
2026 Equity Incentive Plan.
Fair Value Hierarchy and NAV [Axis]
Short-Term Debt, Type [Axis]
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate
Equity volatility
Government grant
Government Assistance, Award Amount
Amount of Government Assistance Awarded
Amount of government assistance awarded.
Grant cost incurred
Property, Plant, and Equipment [Line Items]
Corporate Debt Securities [Member]
Corporate Bonds
Corporate Securities
2025 Warrant
Two Thousand Twenty Five Warrant [Member]
Two thousand twenty five warrant.
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate
Risk-free rate
Percentage of Aggregate Number of Common Stock Shares Outstanding
Percentage of aggregate number of common stock shares outstanding.
Percentage of aggregate number of common stock share outstanding
Antidilutive Securities Excluded From Computation Of Earnings Per Share Outstanding Nonvested Number
Antidilutive securities excluded from computation of earnings per share outstanding nonvested number
Share outstanding
Series A-1 Preferred Units [Member]
Series A-1 Preferred Units.
Series A-1 Preferred Units
Payments of Stock Issuance Costs
Issuance costs
Payment of transaction costs
Service Fee, Software and Other General Prepayments [Member]
Service Fee, Software and Other General Prepayments [Member]
Service Fee Software and Other General Prepayments
Operating Lease, Liability, Current
Current portion of operating lease liabilities
Operating lease liabilities
Accrued Subcontractor Costs
Accrued Subcontractor Costs
Accrued subcontractor costs
Repayments of Long-Term Lines of Credit
Payments
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value
Weighted average grant-date fair value, outstanding as of June 30, 2026
Weighted average grant-date fair value, outstanding as of January 1, 2026
Customer [Domain]
Other Nonoperating Expense
Other expense
Other expense
Supply Agreements for Graphite Components [Member]
Supply agreements for graphite components.
Supply Agreements for Graphite Components
Liabilities and Equity
Total liabilities, mezzanine equity, and member's deficit
Effect of the Reorganization Transactions
Effect of the Reorganization Transactions Value
Effect of the reorganization transactions values.
Research and Development Expense
Research and Development Expense, Total
Research and development
Debt Securities, Held-to-Maturity, Fair Value
Total Fair Value
Aggregate Fair Value
Document Fiscal Period Focus
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
Summary of Fair Value of Options Using Black-Scholes Option Pricing Model
Summary of Equity Based and Unit Based Compensation Expense [Table Text Block]
Summary of equity based and unit based compensation expense .
Summary of Equity based and Unit based compensation expense
Other Depreciation and Amortization
Depreciation and amortization
Property, Plant, and Equipment [Table]
Sale of Stock [Axis]
Increase (Decrease) in Accrued Interest Receivable, Net
Accrued Interest Receivable
Accrued interest receivable
Fair Value, Option, Quantitative Disclosures [Line Items]
Class A And B Common Units
Class A and B Common Units [Member]
Class A and B common units member.
Entity Current Reporting Status
Convertible Notes Payable [Member]
C-2 Convertible Notes
C-2 Notes
Accrued deferred transaction costs
Accrued Deferred Transaction Costs
Deferred Revenue
Deferred Revenue, Total
Long-term deferred revenue
Deferred revenue
Fair Value, Inputs, Level 1 [Member]
Level 1
Class of Stock [Domain]
GOVERNMENT GRANTS FOR PROPERTY AND EQUIPMENT
Government Assistance [Text Block]
Accounts Payable, Current
Accounts Payable, Current, Total
Accounts payable
Financial Instrument [Axis]
Increase (Decrease) in Other Noncurrent Assets
Other long-term assets
Share-Based Compensation Arrangement by Share-Based Payment Award, Option, Nonvested, Weighted Average Exercise Price
Weighted average grant-date fair value, outstanding as of January 1, 2026
Weighted average grant-date fair value, outstanding as of June 30, 2026
Document Transition Report
Liability Class [Axis]
Commitments and Contingencies Disclosure [Abstract]
Recorded Unconditional Purchase Obligation by Category of Item Purchased [Axis]
Class of Warrant or Right [Axis]
Liabilities, Current [Abstract]
Current liabilities
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount
Unrecognized unit-based compensation
Prepaid Costs and Other Current and Long-Term Assets
Prepaid Costs and Other Current and Long Term Assets [Policy Text Block]
Prepaid costs and other current and long-term assets.
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay
% of salary to be matched
Series A-1 Preferred Units Series C Preferred Units and Series B-2 Common Units [Member]
Series A-1 preferred units series C preferred units and series B-2 common units.
Series A-1 Preferred Units, Series C Preferred Units and Series B-2 Common Units
Common Stock [Member]
Common Stock
Schedule of Other Nonoperating Income (Expense) [Table Text Block]
Schedule of Other Income and Expense
Credit Facility [Domain]
Statistical Measurement [Domain]
Employees contribution description
Defined Contribution Plan, Description
Prepaid Expense, Current
Prepaid Expense, Current, Total
Prepaid costs
Equity, Attributable to Parent [Abstract]
Mezzanine equity
Weighted Average Number of Shares Outstanding, Basic
Weighted Average Number of Shares Outstanding, Basic, Total
Weighted-average shares of Class A common stock outstanding - basic
Property, Plant, and Equipment [Abstract]
Assets [Abstract]
Entity Central Index Key
Central Index Key
US Treasury and Government [Member]
U.S. Government Securities
Line of Credit Facility [Table]
Class of Stock [Line Items]
Other Liabilities, Current
Due to related parties
Current Fiscal Year End Date
Class of Warrant or Right [Domain]
Document Quarterly Report
Contract with Customer, Basis of Pricing [Axis]
Debt Instrument, Maturity Date
Debt Instrument, Maturity Date
Net Income (Loss) Available to Common Stockholders, Diluted
Numerator for diluted net loss per share
Cash and Cash Equivalents [Axis]
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss
Gross Unrealized Losses
Gross Unrealized Losses
Fair Value, Inputs, Level 2 [Member]
Level 2
Cash Provided by (Used in) Operating Activity, Including Discontinued Operation
Net cash used in operating activities
Entity Incorporation, State or Country Code
Earnings Per Share, Diluted
Earnings Per Share, Diluted, Total
Net loss attributable to Class A common stock per share - diluted
Deferred Revenue, by Arrangement, Disclosure [Table Text Block]
Schedule of balances recorded within deferred revenue
Preferred Stock, Par or Stated Value Per Share
Original Issue Price
Preferred stock, par value
Net loss attributable to X-Energy, Inc.
Net loss subsequent to Reorganization Transactions
Fair Value Adjustment of Warrants
Amount recognized related to the warrant
Mark-to-market loss on warrant liabilities
Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture
Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture, Total
Equity-based compensation
Ownership [Axis]
Commitments and Contingencies Disclosure [Text Block]
COMMITMENTS AND CONTINGENCIES
Preferred Units [Line Items]
Long-Lived Asset, Class [Domain]
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Discount for Lack of Marketability
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Discount for Lack of Marketability
Discount for lack of marketability
Increase (Decrease) in Operating lease right-of use assets
Increase (Decrease) in Operating lease right-of use assets
Operating lease right-of use assets
Other comprehensive loss
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent
Other comprehensive income (loss)
Other comprehensive income (loss)
Shares issued to convert debt
Debt Conversion, Converted Instrument, Shares Issued
Number of shares to be issued
Comprehensive Income (Loss), Net of Tax, Attributable to Parent
Comprehensive loss attributable to X-Energy, Inc.
Accumulated other comprehensive loss attributable to non-controlling interest
AOCI Including Portion Attributable to Noncontrolling Interest [Member]
Schedule of Revenues and Grant Income by Geographic Location
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue [Table Text Block]
Other Grants [Member]
Other grants.
Other Grants
Temporary Equity Number of Unit Based Compensation Value
Temporary equity number of unit based compensation value.
Unit-based compensation
Mezzanine equity
Fair Value Option, Disclosures [Table]
Summary of Unbilled Receivables and Contract Assets
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block]
Equity Components [Axis]
Gain (Loss) on Investments
Gain (Loss) on Investments, Total
Mark-to-market gain (loss)
Temporary Equity Stock Issued During Period Value Conversion of Profits Interests Units
Temporary equity stock issued during period value conversion of profits interests units
Conversion of profits interests units
Statement of Cash Flows [Abstract]
Fair Value Hierarchy and NAV [Domain]
Income Tax Disclosure [Abstract]
Related Party Expenses [Table TextBlock]
Schedule of Related Party Expenses
Related party expenses.
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value
Weighted average grant-date fair value, options granted
Deferred Offering Costs
Deferred offering costs
Increase (Decrease) in Prepaid Expense and Other Assets
Prepaid and other current assets
Prepaid and other current assets
FAIR VALUE MEASUREMENTS
Fair Value Disclosures [Text Block]
Fair Value Disclosure of Asset and Liability Not Measured at Fair Value [Table]
Long-Term Investments
Long-Term Investments, Total
Long-term investments
Preferred Stock, Shares Authorized
Preferred units authorized
Preferred stock, shares authorized
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements
Exercises/Settlements
Exercises/Settlements
Temporary Equity Stock Issued During Period Value Conversion Of Convertible Securities
Temporary equity stock issued during period value conversion of convertible securities.
Conversion of Warrant into Units
Non Rule 10b5-1 Arrangement Modified [Flag]
Non Rule 10b5-1 Arrangement modified
Non-Rule 10b5-1 Arrangement Modified
Class of Stock [Axis]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount
Potentially dilutive securities excluded from the earnings
Number of Unit Based Compensation Value
Number of unit based compensation value.
Unit-based compensation
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, Year One
Amortized Cost Basis, Due in less than one year
Share Based Compensation Arrangement by Share Based Payment Award, Fair Value Assumptions, Discount Rate
Share based compensation arrangement by share based payment award, fair value assumptions, discount rate.
Discount rate
Expected term
Measurement Input, Expected Term [Member]
Number of Operating Segments
Number of operating segments
Series C Preferred Stock [Member]
Series C Redeemable Convertible Preferred Units [Member]
Series C Preferred Stock
Effect of the reorganization transactions
Effect of Reorganization Transactions
Effect of reorganization transactions.
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss)
Common stock value
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant
Increase (Decrease) in Accounts Payable and Accrued Liabilities
Increase (Decrease) in Accounts Payable and Accrued Liabilities, Total
Accounts payable and accrued liabilities
Temporary Equity, Shares Outstanding
Beginning Balance, Shares
Ending Balance, Shares
Total Units, Outstanding
Schedule of Common Units and Preferred Units Outstanding by Unit Class and Carrying Value [Table Text Block]
Tabular disclosure of common units and preferred units outstanding by unit class and carrying value.
Schedule of Common Units and Preferred Units Outstanding by Unit Class and Carrying Value
Proceeds from Issuance Initial Public Offering
Proceeds from initial public offering, net of underwriting costs
Non-US [Member]
International
Notes Issued
Issued notes convertible
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number
Outstanding stock options
Number of options outstanding as of January 1, 2026
Number of options outstanding as of June 30, 2026
Customer [Axis]
Discount rate
Measurement Input, Discount Rate [Member]
Payments Of Stock Issuance Costs for temporary equity
Payments of stock issuance costs for temporary equity.
Payments of mezzanine equity issuance costs
Document Type
Series C Preferred Units and Series B-2 Common Units [Member]
Series C Preferred Units and Series B-2 Common Units [Member]
Series C Preferred Units and Series B-2 Common Units.
Recorded Unconditional Purchase Obligation, to be Paid, Year Two
2028
Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration]
Warrant Liabilities
Warrant Liabilities [Member]
Warrant Liabilities [Member]
Liabilities and Equity [Abstract]
LIABILITIES, MEZZANINE EQUITY, AND STOCKHOLDERS' EQUITY AND MEMBERS' DEFICIT
Temporory Equity Component [Axis]
Temporory equity component
Payments to Acquire Productive Assets
Payments to Acquire Productive Assets, Total
Capital expenditures
Stock Options
Operating loss
Operating Income (Loss)
Deferred Long-Term Liability Charges
Long-term deferred revenue
Measurement Input, Risk Free Interest Rate [Member]
Risk-free rate
Mezzanine Equity From Common Units Issued As Unit Based Compensation
Amount of Mezzanine Equity from common units issued as Unit-based compensation.
Mezzanine Equity from common units issued as unit based compensation
Cash Provided by (Used in) Operating Activity, Continuing Operation [Abstract]
Cash flows from operating activities:
SUPPLEMENTAL CASH FLOW INFORMATION
Cash Flow, Supplemental Disclosures [Text Block]
Rule 10b5-1 Arrangement Modified [Flag]
Rule 10b5-1 Arrangement modified .
Rule 10b5-1 Arrangement Modified
Cost Plus Fixed Fee Contract [Member]
Cost plus fixed fee
Cost Plus Fixed Fee Contract [Member]
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Schedule of Accumulated Other Comprehensive Income Loss
Cash Tax Savings Amount of Tax Receivable Agreement
Cash tax savings amount of tax receivable agreement.
Amount of Cash tax savings to TRA Holders
Service
Service [Member]
Defined Contribution Plan [Abstract]
United States Government [Member]
United States Government [Member]
United States Government
Entity File Number
Share Based Compensation Arrangement by Share Based Payment Award, Fair Value Assumptions, Credit Spread
Share based compensation arrangement by share based payment award, fair value assumptions, credit spread.
Credit spread
Revenue from Contract with Customer [Text Block]
REVENUE AND GRANT INCOME RECOGNITION
Equipment [Member]
Equipment and Materials
Location, Statement of Income, Balance [Axis]
Warrant liabilities
Warrant Liabilities
Warrant Liabilities
Risk-free rate, Minimum
Retained Earnings [Member]
Accumulated Deficit
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Entity Registrant Name
Registrant Name
Earnings Per Share, Basic, by Common Class, Including Two-Class Method [Table]
Accounting Policies [Abstract]
Net loss
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest
Net loss
Nonrelated Party [Member]
Nonrelated Party
Selling, General and Administrative Expense
Selling, General and Administrative Expense, Total
Selling, general and administrative
General and administrative services
Contribution amount
Defined Contribution Plan, Employer Discretionary Contribution Amount
Land [Member]
Land
Entity Address, Address Line One
Net Income (Loss) Attributable to Noncontrolling Interest
Net Income (Loss) Attributable to Noncontrolling Interest, Total
Less: Net loss attributable to non-controlling interests subsequent to the IPO
Less: Net loss attributable to non-controlling interests
Restricted Stock Awards (RSAs) [Member]
Restricted stock awards (RSAs).
Restricted Stock Awards
UNITED STATES
United States
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period
Number of options exercised
Prepaid cost
Prepaid Expense
Total current assets
Assets, Current
Furniture and Fixtures [Member]
Office Furniture and Fixtures
Recorded Unconditional Purchase Obligation, to be Paid, after Year Three
Recorded unconditional purchase obligation, to be paid, after year three.
2030 and thereafter
Supplemental Cash Flow Information [Abstract]
Related Party Transactions Disclosure [Text Block]
Related Party Transactions
Entity Small Business
Government Assistance [Abstract]
Increase (Decrease) in Accounts and Other Receivables
Accounts receivable and unbilled receivables
Accounts receivable and unbilled receivables
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value
Weighted average grant-date fair value, forfeited
Long-Term Debt, Type [Axis]
Preferred Stock, Dividend Rate, Percentage
Percentage of accumulated preferred return
Significant Accounting Policies [Text Block]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RECENT ACCOUNTING PRONOUNCEMENTS
Accounts receivable
Accounts Receivable, after Allowance for Credit Loss, Current
Accounts Receivable, after Allowance for Credit Loss, Current, Total
Temporary Equity Stock Issued During Period Shares Conversion Of Convertible Securities
Temporary equity stock issued during period shares conversion of convertible securities.
Conversion of Warrant into Units, Shares
Conversion of profits interests units
Stock Issued During Perio Value Conversion of Profits Interests Units
Stock issued during perio value conversion of profits interests units.
Non-controlling Interest
Non-Controlling Interest [Policy Text Block]
Non-controlling Interest.
Earnings Per Share [Abstract]
Time-and-Materials Contract [Member]
Time & materials
Revenue Not from Contract with Customer
Grant income
Plan Name [Axis]
Equity [Abstract]
Product and Service [Domain]
Schedule of Other Significant Noncash Transactions [Table Text Block]
Schedule of Non-Cash Investing and Financing Activities
Equity [Text Block]
STOCKHOLDERS' EQUITY AND MEZZANINE EQUITY
Contract With Customer Warrant As Consideration Payable Exercise Period From Vesting Event
Contract with customer warrant as consideration payable exercise period from vesting event.
Exercise period of 2025 warrant
Fair Value by Liability Class [Domain]
Stock Issued During Period Shares Warrants Exercised
Stock issued during period shares warrants exercised.
Shares warrants exercised
Preferred stock, shares issued
Antidilutive Securities Excluded From Computation Of Earnings Per Share Award Option Outstanding Number
Antidilutive securities excluded from computation of earnings per share award option outstanding number
Outstanding stock options
Restrictions on Cash and Cash Equivalents [Table Text Block]
Schedule of Cash and Cash Equivalents and Restricted Cash
Entity Tax Identification Number
Valuation Approach and Technique [Axis]
Unbilled Receivables, Current
Unbilled receivable
Unbilled Receivables and Contract Assets
Unbilled receivables and contract assets
Advanced Reactor Demonstrator Program ("ARDP")
Advanced Reactor Demonstrator Program [Member]
Advanced Reactor Demonstrator Program [Member]
Equity Component [Domain]
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest
Comprehensive loss
Entity Address, City or Town
IPO Options [Member]
IPO Options .
IPO Options
Measurement Input Type [Domain]
Capital Expenditures Incurred but Not yet Paid
Property and equipment included in accounts payable and accrued expenses
Stock Issued During Period, Value, New Issues
Issuance of stock, net of issuance costs
Restricted Cash, Noncurrent
Restricted cash
Entity Common Stock, Shares Outstanding
Stock Option , Exercise Price
Stock option , exercise price.
Stock option , exercise price
Long Term Debt
Long-Term Debt [Member]
Summary of Significant Accounting Policy [Table]
Summary of Significant Accounting Policy [Table]
Deposits Assets, Noncurrent
Long Term Deposits
Measurement Basis [Axis]
Statement [Table]
Debt Securities, Held-to-Maturity [Table Text Block]
Schedule of Amortized Cost and Estimated Fair Value of Held to Maturity Securities by Contractual Maturity
Deferred Revenue, Current
Deferred Revenue, Current, Total
Deferred revenue
Share based compensation expense
Share-Based Payment Arrangement, Expense
Entity Shell Company
Expected term (years)
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term
Cash Provided by (Used in) Investing Activity, Including Discontinued Operation
Net cash used in investing activities
Statement [Line Items]
Deferred Revenue, Noncurrent
Deferred Revenue, Noncurrent, Total
Long-term deferred revenue
Long-term deferred revenue with related parties
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period
Number of restricted stock vested
Maximum [Member]
Maximum
Debt Conversion, Original Debt, Amount
Proceeds from Issuance of Preferred Limited Partners Units
Proceeds from issuance of Preferred Units
Debt Disclosure [Abstract]
Sale of Stock [Domain]
Temporary Equity, Shares Issued
Total Units, Issued
Class Of Warrant Or Right Issued Face Value
Class of warrant or right issued face value.
Face value of warrants issued
Laura Garcia [Member]
Laura Garcia.
Laura Garcia
DOW Chemical Company
DOW Chemical Company [Member]
DOW Chemical Company [Member]
Investment Income, Interest
Interest income
Notes converted into preferred Units
Debt Conversion, Converted Instrument, Amount
Construction-in-progress
Construction in Progress [Member]
AOCI, Market Risk Benefit, Instrument-Specific Credit Risk, Parent [Member]
Changes in fair value of liabilities under fair value option attributable to changes in instrument specific credit risk
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value
Weighted average grant-date fair value, granted
Common Capital Units [Member]
Common capital units member.
Common Capital Units
Cost-based
Cost Based [Member]
Cost Based [Member]
Contract with Customer, Refund Liability, Current
Incurred cost audits reserve (Note 15)
Assets, Current [Abstract]
Current assets
Series C-1 Preferred Units [Member]
Series C-1 Preferred Units [Member]
Series C-1 Preferred Units
Series C-1 Redeemable Convertible Preferred Units [Member]
Accrued Professional Fees, Current
Accrued professional fees
Document Fiscal Year Focus
Increase (Decrease) in Due to Related Parties
Increase (Decrease) in Due to Related Parties, Total
Due to related parties
Accretion (Amortization) of Discounts and Premiums, Investments
Accretion and amortization on investments
Accretion and amortization on investments
Common Stock, Shares, Outstanding
Common Stock, Shares, Outstanding, Ending Balance
Common Stock, Shares, Outstanding, Beginning Balance
Common Stock, shares outstanding
Equity, Including Portion Attributable to Noncontrolling Interest
Total stockholders' equity and members' deficit
Beginning Balance
Ending Balance
Underwriting Discounts
Underwriting discounts against issuance of common stock
Underwriting discounts
Deposits Assets
Deposits
Accrued Salaries, Current
Accrued compensation and related expenses
Financial Instruments [Domain]
Government Assistance, Type [Axis]
Property, Plant, and Equipment, Excluding Lessor Asset under Operating Lease, Accumulated Depreciation
Accumulated depreciation
Contract with Customer, Basis of Pricing [Domain]
Related Party [Member]
Related Party
Entity Ex Transition Period
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss
Amortized Cost Basis
Amortized Cost Basis, Total
Long-term operating lease liabilities
Operating Lease, Liability, Noncurrent
Long-term portion of operating lease liabilities
Contract with Customer, Liability, Revenue Recognized
Deferred revenue
Revision of Prior Period [Domain]
Cash Provided by (Used in) Investing Activity, Continuing Operation [Abstract]
Cash flows from investing activities:
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings
Change in fair value recognized in Other income (expense), net
Other Accrued Liabilities, Current
Accrued liabilities - other
Security Exchange Name
Measurement Input Type [Axis]
Revenues
Total revenues and grant income
Total revenues and grant income
Related and Nonrelated Parties [Axis]
Series D Preferred Stock [Member]
Series D Redeemable Convertible Preferred Units [Member]
Series D Preferred Stock
New Accounting Pronouncements, Policy [Policy Text Block]
Accounting Standards Recently Adopted
Warrant [Member]
Warrant
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Exercise price of warrants
Class of Warrant or Right, Exercise Price of Warrants or Rights
Entity Address, State or Province
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition
Unit-based compensation recognition period
Weighted average recognition period
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum
Equity volatility, Minimum
Series A Preferred Stock [Member]
Series A Redeemable Convertible Preferred Units [Member]
Series A Preferred Stock
Recorded Unconditional Purchase Obligation [Table]
Operating Lease, Right-of-Use Asset
Operating lease right-of-use assets
Operating lease right-of-use assets ("ROU")
Operating lease right-of-use assets ("ROU")
Amendment Flag
Share-Based Payment Arrangement [Text Block]
EQUITY-BASED COMPENSATION
Debt Instrument [Axis]
Other Nonoperating Income (Expense)
Total other income (expense), net
Other income (expense), net
Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Grant Date Fair Value
Share based compensation arrangements by share based payment award options exercises in period weighted average grant date fair value.
Weighted average grant-date fair value, options exercised
Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation
Cash, cash equivalents and restricted cash at beginning of period
Cash, cash equivalents, and restricted cash at end of period
Cash, cash equivalents, and restricted cash as presented in the Statement of Cash Flows
City Area Code
Interest expense
Interest Expense, Nonoperating
Interest Expense, Nonoperating, Total
Preferred Stock
Preferred Stock [Member]
Accumulated other comprehensive loss attributable to parent and non-controlling interest
AOCI, Equity Method Investment, Parent [Member]
Reported Value Measurement [Member]
Carrying Value
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, Year One
Fair Value, Due in less than one year
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Comprehensive Income, Policy [Policy Text Block]
Other Comprehensive Income (Loss)
Proceeds from Issuance of Common Stock
Net proceeds
Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block]
Cash, Cash Equivalents, and Restricted Cash
Foreign currency translation adjustment
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent, Total
Operating expenses
Operating Expenses [Abstract]
Recorded Unconditional Purchase Obligation, to be Paid, Year One
2027
Computer Equipment [Member]
Computer Equipment and Software
Two Thousand Twenty Four Warrants [Member]
Two Thousand Twenty Four Warrants [Member]
2024 Warrants
Common stock, par value
Common Stock, Par or Stated Value Per Share
Short-Term Debt, Type [Domain]
Related Party Customer [Member]
Related Party Customer.
Related Party Customer
Total current liabilities
Liabilities, Current
Leasehold Improvements [Member]
Leasehold Improvements
Temporary Equity, Liquidation Preference
Total Units, Liquidation Preference
Issuance of Series C-1 Preferred Units, net of issuance costs, Shares
Temporary Equity Stock Issued During Period Shares New Issues
Temporary equity stock issued during period shares new issues.
SEGMENTS
Segment Reporting [Text Block]
Defined Contribution Plan, Cost
Contribution amount
Trading Symbol
Geographical [Axis]
Prior to the IPO [Member]
Prior to the IPO.
Prior to the IPO
Granted IPO Options To X-Energy's Directors [Member]
Granted IPO options to X-Energy's directors.
Granted IPO Options to X-Energy's Directors
Amortization of Debt Issuance Costs and Discounts
Amortization of Debt Issuance Costs and Discounts, Total
Amortization of deferred financing costs, debt discount, and other
Property, Plant, and Equipment [Table Text Block]
Schedule of Property and Equipment, Net
Revenue from Contract with Customer, Including Assessed Tax
Total revenues and grant income
Services revenue
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period
Number of restricted stock granted
Entity Emerging Growth Company
Net Loss Prior to Reorganization Transactions
Net loss prior to reorganization transactions.
Net loss prior to Reorganization Transactions
Additional Paid-in Capital [Member]
Additional Paid-in Capital
Unvested IPO Options
Unvested IPO Options [Member]
Unvested IPO Options.
Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture
Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture, Total
Equity-based compensation, Shares
Fair Value Measurement [Domain]
Plan Name [Domain]
Allowance for Credit Losses
Debt Securities, Held-to-Maturity, Allowance for Credit Loss
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Ending Balance
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Beginning Balance
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Total
Common Class A [Member]
Class A common stock
Class A Common Units
Portion at Fair Value Measurement [Member] [Default]
Portion at Fair Value Measurement [Member]
PROFIT SHARING PLAN
Defined Contribution Plan [Text Block]
US Treasury Securities [Member]
Government Treasury Bills
Measurement Input, Price Volatility [Member]
Equity volatility
Revision of Prior Period [Axis]
Share-Based Payment Arrangement, Activity [Table Text Block]
Summary of Stock Award Activities and Changes
Cover [Abstract]
Recorded Unconditional Purchase Obligations [Table Text Block]
Commitments to Purchase Goods or Services Related to Supply Agreements
Preferred Stock, Amount of Preferred Dividends in Arrears
Accumulated preferred return
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]
Schedule of Valuation Techniques and Significant Unobservable Inputs
Equity, Attributable to Noncontrolling Interest
Equity, Attributable to Noncontrolling Interest, Ending Balance
Equity, Attributable to Noncontrolling Interest, Beginning Balance
Equity, Attributable to Noncontrolling Interest, Total
Non-controlling interests
Recorded Unconditional Purchase Obligation [Line Items]
Revenue from Contract with Customer [Abstract]
Payments to Acquire Investments
Payments to Acquire Investments, Total
Purchase of investments
Purchase of investments
Long-Term Debt, Type [Domain]
Defined Contribution Plan, Employer Matching Contribution, Percent of Match
% match
Accumulated Other Comprehensive Income (Loss), Net of Tax
Accumulated Other Comprehensive Income (Loss), Net of Tax, Total
Accumulated other comprehensive income (loss)
Ending Balance
Beginning Balance
Concentration Risk, Credit Risk, Policy [Policy Text Block]
Certain Significant Risks and Uncertainties
Share-Based Payment Arrangement, Noncash Expense
Share-Based Payment Arrangement, Noncash Expense, Total
Unit-based compensation expense
Equity-based and unit-based compensation
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
Schedule of Rollforward of Level 3 Measurements
Additional Paid in Capital
Additional Paid in Capital, Total
Additional paid-in capital
Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract]
Adjustments to reconcile net loss to net cash used in operating activities:
Short-Term Investments
Short-Term Investments, Total
Short-term investments
Fair Value Disclosures [Abstract]
Cash and Cash Equivalent
Cash and Cash Equivalent, Total
Cash and cash equivalents
X-Energy Reactor Company, LLC [Member]
X-Energy Reactor Company, LLC.
X-Energy Reactor Company LLC
Payments of Debt Issuance Costs
Payment of debt issuance costs
Issuance Costs
Payment of debt issuance costs
Net Loss Attributable To X E R C Prior To I P O and Non Controlling Interests Subsequent To I P O
Net loss attributable to XERC prior to IPO and non-controlling interests subsequent to IPO.
Less: Net loss attributable to non-controlling interests
Net loss
Noncontrolling Interest [Member]
Non-Controlling Interest
Cash Provided by (Used in) Financing Activity, Including Discontinued Operation
Net cash provided by financing activities
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value
Ending Balance
Beginning Balance
Schedule of Balance Receivable Related to Services Revenue and Government Grants
Schedule of Related Party Transactions [Table Text Block]
Payables and Accruals [Abstract]
Net Income (Loss) Available to Common Stockholders, Basic
Numerator for basic net loss per share
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period
Number of options forfeited
Entity Filer Category
Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect, Continuing Operation
Net increase (decrease) in cash, cash equivalents, and restricted cash
Net increase (decrease) in cash, cash equivalents, and restricted cash
Debt Instrument, Name [Domain]
Contract with Customer, Asset, Reclassified to Receivable
Revenue Recognized, Contract Assets
Segment Reporting, CODM, Profit (Loss) Measure, How Used, Description
Property, Plant, and Equipment, after Accumulated Depreciation, Depletion, and Amortization
Property and equipment, net
Property and equipment, net
Profits Interest Units Conversion and IPO Options Awards [Member]
Profits Interest Units Conversion and IPO Options Awards.
Profits Interest Units Conversion and IPO Options Awards
Granted IPO Options To Executive Officers [Member]
Granted IPO options to executive officers.
Granted IPO Options to Executive Officers
Beginning Balance, Shares
Shares, Outstanding
Ending Balance, Shares
Net Loss Attributable to XERC Prior to IPO and Non Controlling Interests Subsequent to IPO Prior Transactions
Net loss attributable to XERC prior to IPO and non controlling interests subsequent to IPO prior transactions.
Net loss prior to Reorganization Transactions
Measurement Input, Credit Spread [Member]
Credit spread
Document Information [Line Items]
Debt Security, Government, Non-US [Member]
Foreign Issuer Debt Securities
Foreign Securities
Temporary Equity Effect of the Reorganization Transactions Value
Temporary equity effect of the reorganization transactions value.
Effect of the Reorganization Transactions
Segment Reporting [Abstract]
Schedule of Due from and Due to related parties and Long-term deferred revenue [Table TextBlock]
Schedule of Due from and Due to related parties and Long-term deferred revenue
Due from and Due to related parties and Long-term deferred revenue
Accrued Payable In Kind Interest
Accrued Payable In Kind Interest
Accrued Payable-In-Kind Interest
Compensation Related Costs [Abstract]
Entity Address, Postal Zip Code
Statement of Financial Position [Abstract]
Live Oak Credit Facility [Member]
Live Oak Credit Facility Member
Live Oak Credit Facility
Local Phone Number
Net Loss Subsequent to Reorganization Transactions
Net loss subsequent to reorganization transactions.
Net loss subsequent to Reorganization Transactions