Document and Entity Information Document Information [Table] Class of Stock [Axis] Class of Stock [Domain] Common Stock [Member] Common Stock Series A cumulative redeemable perpetual preferred stock. 9.375% Series A Cumulative Redeemable Perpetual Preferred Stock [Member] 9.375% Series A Cumulative Redeemable Perpetual Preferred Stock, $0.001 par value Document Information [Line Items] Document Type Document Quarterly Report Document Period End Date Document Transition Report Securities Act File Number Entity Registrant Name Entity Incorporation, State or Country Code Entity Tax Identification Number Entity Address, Address Line One Entity Address, City or Town Entity Address, State or Province Entity Address, Postal Zip Code City Area Code Local Phone Number Title of 12(b) Security Trading Symbol Security Exchange Name Entity Current Reporting Status Entity Interactive Data Current Entity Filer Category Entity Small Business Entity Emerging Growth Company Entity Shell Company Entity Common Stock, Shares Outstanding Entity Central Index Key Current Fiscal Year End Date Document Fiscal Year Focus Document Fiscal Period Focus Amendment Flag Condensed Consolidated Balance Sheets Statement [Table] Statement [Table] Related and Nonrelated Parties [Axis] Related and Nonrelated Parties [Domain] Other Affiliates [Member] Related party Statement [Line Items] Commitments and Contingencies Assets [Abstract] ASSETS Assets, Current [Abstract] Current assets Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents Accounts Receivable, after Allowance for Credit Loss, Current Accounts receivable, net Inventory, Net Inventory Total inventories Accounts and Other Receivables, Net, Current Company owed amount Other receivables Prepaid Expense and Other Assets, Current Prepaid expenses and other current assets Assets, Current Total current assets Property, Plant and Equipment, Net Property, plant and equipment, net Property and equipment, net Operating Lease, Right-of-Use Asset Operating lease right-of-use asset, net Restricted Cash and Cash Equivalents, Noncurrent Restricted cash Equity Securities, FV-NI, Noncurrent Equity investments, at fair value Finite-Lived Intangible Assets, Net Intangible assets, net Net intangible assets Other Assets, Noncurrent Other assets Assets Segment assets Total assets Liabilities and Equity [Abstract] LIABILITIES AND STOCKHOLDERS' EQUITY (DEFICIT) Liabilities, Current [Abstract] Current liabilities Accounts Payable and Accrued Liabilities, Current Accounts payable and accrued expenses Taxes Payable, Current Income taxes payable Represents information pertaining to warrant liabilities current. Warrant Liabilities Current Common Stock Warrant liabilities at end of period Common Stock Warrant liabilities at beginning of period Common stock warrant liabilities Operating Lease, Liability, Current Operating lease liabilities, short-term Partner company notes payable, short-term Partner company notes payable, short-term Partner company notes payable, short-term Other Liabilities, Current Other current liabilities Liabilities, Current Total current liabilities Notes Payable, Noncurrent Notes payable, long-term Operating Lease, Liability, Noncurrent Operating lease liabilities, long-term Carrying amount of partner company redeemable perpetual preferred liability, as of the reporting date. Partner Company Redeemable Perpetual Preferred Liability Partner company redeemable perpetual preferred liability Other Liabilities, Noncurrent Other long-term liabilities Liabilities Total liabilities Commitments and Contingencies. Commitments and contingencies (Note 14) Equity, Attributable to Parent [Abstract] Stockholders' equity (deficit) Preferred Stock, Value, Issued Cumulative redeemable perpetual preferred stock, $0.001 par value, 15,000,000 authorized, 5,000,000 designated Series A shares, 3,427,138 shares issued and outstanding as of March 31, 2026 and December 31, 2025, respectively, liquidation value of $25.00 per share Common Stock, Value, Issued Common stock, $0.001 par value, 200,000,000 shares authorized, 33,186,671 and 31,364,094 shares issued and outstanding as of March 31, 2026 and December 31, 2025, respectively Additional Paid in Capital Additional paid-in-capital Retained Earnings (Accumulated Deficit) Accumulated deficit Equity, Attributable to Parent Total stockholders' equity attributed to the Company Equity, Attributable to Noncontrolling Interest Non-controlling interests Equity, Including Portion Attributable to Noncontrolling Interest Balance Balance Total stockholders' equity Liabilities and Equity Total liabilities and stockholders' equity Preferred Stock, Par or Stated Value Per Share Preferred Stock, par value Preferred Stock, Shares Authorized Preferred Stock, shares authorized It represents number of preferred stock shares designated. Preferred Stock shares designated Preferred Stock, Shares Issued Preferred Stock, shares issued Preferred Stock, Shares Outstanding Preferred Stock, shares outstanding Preferred Stock Liquidating Preference Preferred Stock, liquidation preference per share Common Stock, Par or Stated Value Per Share Common Stock, par value Common Stock, Shares Authorized Common Stock, shares authorized Common Stock, Shares, Issued Common Stock, shares issued Common Stock, Shares, Outstanding Common Stock, shares outstanding Condensed Consolidated Statements of Operations Revenues [Abstract] Revenue Revenue from Contract with Customer, Including Assessed Tax Revenue Product revenue, net Collaboration revenue. Collaboration revenue Collaboration revenue Collaboration revenue Other Income Other revenue Revenues Net revenue Operating Expenses [Abstract] Operating expenses Cost of Goods and Services Sold Cost of goods - (excluding amortization of acquired intangible assets) Amortization of Intangible Assets Amortization of acquired intangible assets Research and Development Expense (Excluding Acquired in Process Cost) Research and development Research and development Selling, General and Administrative Expense Selling, general and administrative Costs and Expenses Total operating expenses Operating Income (Loss) Loss from operations Nonoperating Income (Expense) [Abstract] Other income (expense) Investment Income, Interest Interest income Amount of the cost of borrowed funds accounted for as interest expense and amount of debt issuance costs. Interest Expense And Finance Fees Interest expense and financing fee Gain (Loss) on Disposition of Intangible Assets Gain on sale of priority review voucher, net of expenses Embedded Derivative, Gain (Loss) on Embedded Derivative, Net Change in fair value of partner company derivative liability Change in fair value of partner company derivative liability Fair value of embedded derivative Amount of gain (loss) on common stock warrant liabilities. Gain/Loss on common stock warrant liabilities Gain (loss) on common stock warrant liabilities Gain (loss) on common stock warrant liabilities Other Nonoperating Income (Expense) Other income (expense) Other income (expense) Nonoperating Income (Expense) Total other income (expense) Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Income (loss) before income tax expense Pre-tax income Income Tax Expense (Benefit) Income tax expense Income tax expense Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net income (loss) Net income (loss) Net Income (Loss) Attributable to Noncontrolling Interest Attributable to non-controlling interests Net income (loss) attributable to Fortress Attributable to common stockholders Preferred Stock Dividends and Other Adjustments Preferred A dividends declared and paid and/or cumulated, and Fortress' share of subsidiary deemed dividends Net Income (Loss) Available to Common Stockholders, Basic Net income (loss) attributable to common stockholders Net income (loss) attributable to common stockholders Earnings Per Share, Basic Net income (loss) per common share attributable to common stockholders - basic Earnings Per Share, Diluted Net income (loss) per common share attributable to common stockholders - diluted Weighted Average Number of Shares Outstanding, Basic Weighted average common shares outstanding - basic Weighted Average Number of Shares Outstanding, Diluted Weighted average common shares outstanding - diluted Weighted average common shares outstanding - diluted Consolidated Statements of Changes in Stockholders' Equity Equity Components [Axis] Equity Component [Domain] Parent [Member] Preferred Stock [Member] Preferred Stock Additional Paid-in Capital [Member] Additional Paid-In Capital Accumulated Distributions in Excess of Net Income [Member] Accumulated Deficit Noncontrolling Interest [Member] Non-Controlling Interests Shares, Outstanding Balance (in shares) Balance (in shares) APIC, Share-Based Payment Arrangement, ESPP, Increase for Cost Recognition Stock-based compensation expense Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture Issuance of common stock related to equity plans Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Issuance of common stock related to equity plans (in shares) Amount of increase (decrease) in additional paid in capital (APIC) resulting from exchange of partner company preferred shares. Adjustments To Additional Paid In Capital, Exchange Of Partner Company Preferred Shares Exchange of partner company preferred shares Stock Issued During Period, Value, New Issues Issuance of stock for equity offerings, net Stock Issued During Period, Shares, New Issues Issuance of common stock for equity offering, net (in shares) Issuance of stock for equity offerings, net (in shares) Shares issued Value of stock issued during period for cash at the market cost. Issuance of Common Stock for At the Market Offering Issuance of common stock for at-the-market offering, net It represents the stock issued during period shares issued for cash at market cost. Issuance of Common Stock for At the Market Offering in shares Issuance of common stock for at-the-market offering, net (in shares) Amount of increase (decrease) to additional paid in capital (APIC) resulting from offerings, net and warrant exercises. Adjustments to Additional Paid in Capital, Partner Companies Offerings, Net and Warrant Exercises Partner companies' offerings, net and warrant exercises Adjustments to Additional Paid in Capital, Dividends in Excess of Retained Earnings Preferred A dividends declared and paid Preferred Stock dividends Amount of decrease in additional paid in capital (APIC) resulting from subsidiary's at market offering costs. Adjustments To Additional Paid In Capital Subsidiary At Market Offering Partner companies' at-the-market offering, net Issuance of common stock under partner company's Employee stock purchase program. Issuance of common stock under partner company's Employee stock purchase program Issuance of common stock under partner company's ESPP Amount of decrease in additional paid in capital (APIC) resulting from dividends legally declared (or paid) in excess of common stock. Adjustments To Additional Paid In Capital Dividends In Excess Of Common Stock Partner company's dividends declared and paid Value of stock issued as a result of the exercise of warrants. Stock Issued During Period, Value, Warrants Exercised Exercise of warrants Number of stock issued as a result of the exercise of warrants. Stock Issued During Period, Shares, Warrants Exercised Exercise of warrants (in shares) Number of shares issued upon exercise of warrants Partner company's exercise of stock options for the purpose of cash. Partner company exercise of options for cash Partner company's exercise of options for cash Amount of decrease/increase in additional paid in capital (APIC) and non controlling interest in subsidiaries. Adjustments To Additional Paid In Capital And Noncontrolling Interest From Subsidiary Equity Issuance Non-controlling interest in partner companies Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest Attributable to non-controlling interest Condensed Consolidated Statements of Cash Flows Net Cash Provided by (Used in) Operating Activities [Abstract] Cash Flows from Operating Activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Reconciliation of net income (loss) to net cash used in operating activities: Depreciation Depreciation expense Accounts Receivable, Credit Loss Expense (Reversal) Bad debt expense Amortization of Debt Discount (Premium) Amortization of debt discount Gain (Loss) on Termination of Lease Gain on termination of partner company lease Net gain on lease termination The increase (decrease) during the reporting period in the settlement of amounts payable to vendors for goods and services received but not paid. Settlement of Partner Company Payables Settlement of partner company payables Operating Lease, Right-of-Use Asset, Periodic Reduction Reduction in the carrying amount of operating lease right-of-use assets Share-Based Payment Arrangement, Noncash Expense Stock-based compensation expense Equity Securities, FV-NI, Unrealized Gain (Loss) Change in fair value of investment Amount of expense (income) related to change in fair value of contingently issuable warrants. Change In Fair Value Of Contingently Issuable Warrants Change in fair value of partner companies' warrant liabilities Increase (Decrease) in Operating Capital [Abstract] Increase (decrease) in cash and cash equivalents resulting from changes in operating assets and liabilities: Increase (Decrease) in Accounts Receivable Accounts receivable Increase (Decrease) in Inventories Inventory Increase (Decrease) Due from Other Related Parties Other receivables - related party Increase (Decrease) in Prepaid Expense and Other Assets Prepaid expenses and other current assets Increase (Decrease) in Other Operating Assets Other assets Increase (Decrease) in Accounts Payable and Accrued Liabilities Accounts payable and accrued expenses Increase (Decrease) in Income Taxes Payable Income taxes payable The increase decrease in lease liabilities. Increase Decrease In Lease Liabilities Lease liabilities Increase (Decrease) in Other Operating Liabilities Other long-term liabilities Net Cash Provided by (Used in) Operating Activities Net cash provided by (used in) operating activities Net Cash Provided by (Used in) Investing Activities [Abstract] Cash Flows from Investing Activities: Proceeds from Sale of Other Property, Plant, and Equipment Proceeds from sale of property and equipment Net Cash Provided by (Used in) Investing Activities Net cash provided by investing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Cash Flows from Financing Activities: Proceeds from Issuance of Common Stock Proceeds from issuance of common stock for at-the-market offering, net The cash inflow from the additional capital contribution to the entity from under the Employee Stock Purchase Plan Proceeds from issuance of common stock under ESPP Proceeds from issuance of common stock under ESPP Proceeds from Warrant Exercises Exercise of warrants for cash The amount of cash inflow from subsidiary's employee stock purchase plan (ESPP). Proceeds From Subsidiary's Employee Stock Purchase Plan Proceeds from partner companies' ESPP Payments of Ordinary Dividends, Common Stock Partner company's dividends declared and paid The amount of cash outflow for exchange of partner company preferred shares. Payments For Exchange Of Partner Company Preferred Shares Exchange of partner company preferred shares The amount of cash outflow for redemption of partner company preferred shares. Payments For Redemption Of Partner Company Preferred Shares Redemption of partner company preferred shares Proceeds from partner companies' sale of stock and warrants Proceeds From Partner Companies Sale of Stock and Warrants, Net Proceeds from partner companies' equity offerings and warrant exercises, net The cash inflow from the issuance of subsidiaries at the market offering capital contribution to the entity. Proceeds From Issuance Of Subsidiaries At Market Offering Proceeds from partner companies' at-the-market offering, net The cash inflow associated with the amount received from holders exercising the partner companies options and warrants. Proceeds From Exercise Of Partner Companies Options And Warrants, Net Proceeds from exercise of partner company's options, net The cash outflow paid to the Oaktree Note. Payment of Oaktree Note Repayment of Oaktree Note and debt issuance costs Repayment of Oaktree Note and debt issuance costs Repayments of Notes Payable Repayment of partner company installment payments - licenses Net Cash Provided by (Used in) Financing Activities Net cash provided by (used in) financing activities Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Net increase in cash and cash equivalents and restricted cash Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents Cash and cash equivalents and restricted cash at end of period Cash and cash equivalents and restricted cash at beginning of period Total cash and cash equivalents and restricted cash Supplemental Cash Flow Information [Abstract] Supplemental disclosure of cash flow information: Interest Paid, Excluding Capitalized Interest, Operating Activities Cash paid for interest Other Noncash Investing and Financing Items [Abstract] Supplemental disclosure of non-cash financing and investing activities: The amount of unpaid partner company's offering cost that were incurred during a noncash or partial noncash transaction. Unpaid Partner Company Offering Cost Unpaid partner company's offering cost Organization and Description of Business