Document And Entity Information
Patent Costs [Policy Text Block]
Patent costs.
Note To Financial Statement Details Textual
Liquidity [Policy Text Block]
Disclosure of accounting policy for liquidity.
Significant Accounting Policies
Note 2 - Fair Value of Financial Instruments
Money Market Securities [Member]
Related to money market securities.
us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Income taxes computed at U.S. statutory rates, amount
dmrc_PercentageOfConcentrationRiskCreditRiskFinancialInstrumentsUnderOptionOne
Percentage of Concentration Risk Credit Risk Financial Instruments Under Option One
Percentage of concentration risk credit risk financial instruments under option one.
Note 3 - Revenue Recognition
Risk-free interest rate
Unrealized gain (loss) on marketable securities, net of tax of $0
dmrc_ConcentrationRiskCreditRiskFinancialInstrumentsUnderOptionTwo
Concentration Risk Credit Risk Financial Instruments Under Option Two
Concentration risk credit risk financial instruments under option two.
Note 4 - Segment Information
dmrc_PercentageOfCreditExposureLimitsBasedOnCashAndCashEquivalentsAndMarketableSecurities
Percentage of Credit Exposure Limits Based on Cash and Cash Equivalents and Marketable Securities
Percentage of credit exposure limits Based on cash and cash equivalents and marketable securities.
Note 5 - Stock-based Compensation
dmrc_CreditExposureLimitsOfCashAndCashEquivalentsAndMarketableSecuritiesUnderOptionTwo
Credit Exposure Limits of Cash and Cash Equivalents and Marketable Securities Under Option Two
Credit exposure limits of cash and cash equivalents and marketable securities under option two.
Note 6 - Earnings Per Share
Note 7 - Trade Accounts Receivable
Cash equivalents and marketable securities, 5-10 years
Cash equivalents and marketable securities maturity year five through ten year, fair value.
Note 8 - Property and Equipment
Cash equivalents and marketable securities, more than 10 years
Cash equivalents and marketable securities maturity more than ten year, fair value.
dmrc_PeriodOfRevenueFromServices
Period of Revenue From Services (Month)
Period of revenue from services.
Note 9 - Goodwill
dmrc_SubscriptionRevenueTermMinimum
Subscription Revenue Term, Minimum (Year)
Subscription revenue term minimum.
Income Tax Disclosure [Text Block]
Note 10 - Intangibles
Note 11 - Leases
Federal Agency Notes [Member]
Related to federal agency notes.
Unrealized gain (loss) on marketable securities
us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Note 13 - Defined Contribution Plan
Note 14 - Other Income
Expected volatility
Cash equivalents and marketable securities, less than 1 year
Cash equivalents and marketable securities maturity less than one year, fair value.
Note 15 - Income Taxes
us-gaap_LiabilitiesCurrent
Total current liabilities
Cash equivalents and marketable securities, 1-5 years
Cash equivalents and marketable securities maturity year one through five year, fair value.
Note 16 - Accounts Payable and Other Accrued Liabilities
Employee [Member]
Related to employee.
Note 18 - Corporate Reorganization
Note 2 - Fair Value of Financial Instruments - Summary of Fair Value Hierarchy for Financial Assets (Details)
Expected term (Year)
Note 2 - Fair Value of Financial Instruments - Summary of Fair Value Maturities for Financial Asset (Details)
dmrc_SubscriptionRevenueTermMaximum
Subscription Revenue Term, Maximum (Year)
Subscription revenue term maximum.
Note 3 - Revenue Recognition - Schedule of Disaggregated Revenue By Major Product Line in Single Reporting Segment (Details)
dmrc_ContractWithCustomerLiabilityTransactionPriceFromContractualObligations
Contract With Customer Liability, Transaction Price From Contractual Obligations
Contract with customer liability transaction price from contractual obligations.
Note 3 - Revenue Recognition - Schedule of Contract Assets from Contracts with Customers from Acquisition (Details)
Note 3 - Revenue Recognition - Schedule of Contract Liabilities from Contracts with Customers (Details)
Commercial [Member]
Related to commercial.
Fair value of instrument vested
Note 4 - Segment Information - Schedule of Segment Reporting Information (Details)
Schedule of Share-Based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block]
Note 4 - Segment Information - Revenue by Geographic Area (Details)
dmrc_TradeReceivableNet
Trade accounts receivable, net
Trade receivable net.
Note 4 - Segment Information - Customers Accounted for 10% or More of Revenue (Details)
Unpaid deferred revenue included in trade accounts receivable
Unpaid deferred revenues included in accounts receivable.
Estimated useful life (Year)
Schedule of Accounts Receivable By Major Customers By Reporting Segments [Table Text Block]
Schedule of accounts receivable by major customers by reporting segments.
Note 4 - Segment Information - Long-Lived Tangible Assets by Geographical Area (Details)
Share-Based Payment Arrangement, Nonvested Award, Cost [Table Text Block]
Note 5 - Stock-based Compensation - Schedule of Valuation Assumptions (Details)
Company A [Member]
Related to Company A.
Note 5 - Stock-based Compensation - Schedule of Valuation Assumptions for ESPP (Details)
Customer C [Member]
Represents customer c.
Note 5 - Stock-Based Compensation - Allocation of Stock-Based Compensation (Details)
Employee Service Share Based Compensation Non Vested Awards Compensation Cost Not Yet Recognized Period for Recognition [Table Text Block]
Employee service share based compensation non vested awards compensation cost not yet recognized period for recognition.
Note 5 - Stock-based Compensation - Unrecognized Compensation Cost Related to Non-vested Stock-based Awards Granted (Details)
Note 5 - Stock-based Compensation - Weighted Average Period for Recognition of Unrecognized Compensation Cost for Stock Options and Restricted Stock (Details)
Foreign currency translation adjustments
Foreign currency translation adjustment, net of tax of $0
Note 5 - Stock-based Compensation - Schedule of Unvested Restricted Stock Activity (Details)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Granted, weighted average grant date fair value (in dollars per share)
Share-Based Payment Arrangement, Performance Shares, Activity [Table Text Block]
Proceeds from maturities of marketable securities
Note 5 - Stock-based Compensation - Fair Value of Vested Restricted Stock Awards (Details)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
Vested, weighted average grant date fair value (in dollars per share)
Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
Forfeited, weighted average grant date fair value (in dollars per share)
Note 5 - Stock-based Compensation - Schedule of Unvested Restricted Stock Units (Details)
dmrc_UndistributedEarningsAttributableToPreferredStock
Undistributed Earnings Attributable to Preferred Stock
Undistributed earnings attributable to preferred stock.
US Treasury Securities [Member]
Note 5 - Stock-based Compensation - Fair Value of Vested Restricted Stock Units (Details)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
Unvested, weighted average grant date fair value (in dollars per share)
Unvested, weighted average grant date fair value (in dollars per share)
Company B [Member]
Related to Company B.
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
Forfeited (in shares)
Note 5 - Stock-based Compensation - Schedule of Unvested Performance Stock Unit (Details)
Note 5 - Stock-based Compensation - Fair Value of Vested Performance Stock Units (Details)
Schedule of Share-Based Compensation, Employee Stock Purchase Plan, Activity [Table Text Block]
Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Note 5 - Stock-based Compensation - Employee Stock Purchase Plan Activity (Details)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
Unvested (in shares)
Unvested (in shares)
Lessee Operating Lease Details of Leases Presented in Balance Sheets [Table Text Block]
Lessee, operating lease, details of leases presented in balance sheets.
Note 6 - Earnings Per Share - Summary of Reconciliation of Earnings (Loss) Per Common Share (Details)
Note 6 - Earnings Per Share - Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share (Details)
Derivative Lawsuits Filed in US District Court for District of Oregon [Member]
Represents the derivative lawsuits filed in the US district court for the district of Oregon.
Note 7 - Trade Accounts Receivable - Summary of Trade Accounts Receivable (Details)
Note 7 - Trade Accounts Receivable - Customers Accounted for 10% or More of Trade Accounts Receivable, Net (Details)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Granted (in shares)
Stock Incentive Plan [Member]
Related to stock incentive plan.
Derivative Lawsuits Filed in Circuit Court of State of Oregon [Member]
Represents the derivative lawsuits filed in the circuit court of the state of Oregon.
Corporate Debt Securities [Member]
Note 8 - Property and Equipment - Depreciation and Amortization On Property and Equipment Using the Straight-line Method (Details)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
Vested (in shares)
Note 9 - Goodwill - Summary of Goodwill (Details)
Note 10 - Intangibles - Amortization of Intangible Assets Acquired (Details)
Nonvested Restricted Stock Shares Activity [Table Text Block]
Note 10 - Intangibles - Amortization Expense on Intangible Assets (Details)
Note 10 - Intangibles - Estimated Future Aggregate Amortization Expense (Details)
Valuation Technique, Black-Scholes-Merton Model [Member]
Note 11 - Leases - Additional Details of Leases Presented in Consolidated Balance Sheets (Details)
Note 11 - Leases - Additional Details of Leases Presented in Consolidated Balance Sheets (Details) (Parentheticals)
Note 11 - Leases - Additional Details of Operating Lease Expense (Details)
Note 11 - Leases - Reconciliation of Undiscounted Cash Payment Obligations of Operating Lease Liability (Details)
Note 13 - Defined Contribution Plan - Statement of Company Made Matching Contributions (Details)
Note 14 - Other Income - Other Income, Net (Details)
Note 15 - Income Taxes - Components of Income (Loss) Before Income Taxes (Details)
Note 15 - Income Taxes - Components of Tax Benefit (Provision) Allocated to Continuing Operations (Details)
Note 15 - Income Taxes - Reconciliation of Statutory Federal Income Tax Rate to Effective Income Tax Rate (Details)
Note 15 - Income Taxes - Components of Deferred Tax Assets and Deferred Tax Liabilities (Details)
Note 15 - Income Taxes - Summary of Reconciliation of Uncertain Tax Positions (Details)
Note 16 - Accounts Payable and Other Accrued Liabilities - Schedule of Accounts Payable and Accrued Liabilities (Details)
Note 18 - Corporate Reorganization - Schedule of Reorganization (Details)
Notes To Financial Statements
Notes To Financial Statements [Abstract]
us-gaap_PaymentsToAcquireMarketableSecurities
Purchases of marketable securities
Financial Instruments [Domain]
Accounts payable and other accrued liabilities
Accounts Payable and Accrued Liabilities, Current
Total
Deferred revenue
Deferred revenue, current
Financial Instrument [Axis]
Schedule of Goodwill [Table Text Block]
Stock price (in dollars per share)
Goodwill [Table]
Accrued liabilities
Lessee, Operating Leases [Text Block]
Accounts payable
Loans, Notes, Trade and Other Receivables Disclosure [Text Block]
Federal and state net operating losses
dmrc_DeferredTaxAssetsOperatingLossCarryforwardFederalAndState
Deferred tax assets operating loss carryforward federal and state.
ASC 842 - lease liabilities
dmrc_DeferredTaxAssetsLeaseLiabilities
Deferred tax assets arising from lease liabilities.
Schedule of Fair Value of Restricted Stock Awards Vested [Table Text Block]
Schedule of fair value of restricted stock awards vested.
dmrc_FederalNetOperatingLossCarryforwardsExpirationPeriodMinimum
Federal Net Operating Loss Carryforwards, Expiration Period Minimum (Year)
Federal net operating loss carryforwards expiration period minimum.
us-gaap_PolicyTextBlockAbstract
Accounting Policies
dmrc_FederalTaxCreditCarryforwardExpirationPeriodMaximum
Federal Tax Credit CarryForward, Expiration Period, Maximum (Year)
Federal tax credit carry forward expiration period maximum.
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate
Share-Based Compensation Arrangement by Share-Based Payment Award, Maximum Employee Subscription Rate
us-gaap_LossContingencyNewClaimsFiledNumber
Loss Contingency, New Claims Filed, Number
Shares Issued (in shares)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)
Issuance of shares pursuant to Employee Stock Purchase Plan
us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent
Share-Based Compensation Arrangement by Share-Based Payment Award, Purchase Price of Common Stock, Percent
us-gaap_PaymentsToAcquireIntangibleAssets
Capitalized patent costs
The Government [Member]
Related to the government.
us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Purchase of property and equipment
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized (in shares)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)
Cash received (paid) for income taxes, net
Goodwill Disclosure [Text Block]
Liabilities, Current [Abstract]
Developed Technology Rights [Member]
Supplemental disclosure of cash flow information:
us-gaap_Assets
Long-lived tangible assets
Total assets
us-gaap_OperatingLeaseImpairmentLoss
Operating Lease, Impairment Loss
Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table]
Patents [Member]
Plan Name [Axis]
Plan Name [Domain]
Total unrecognized compensation costs
Operating lease expense
Weighted average period (in years) (Year)
Intellectual Property [Member]
Customer Relationships [Member]
Stock-based compensation capitalized to software and patent costs
us-gaap_CapitalizedContractCostNet
Total
Share-Based Payment Arrangement [Text Block]
Finite-Lived Intangible Assets by Major Class [Axis]
Finite-Lived Intangible Assets, Major Class Name [Domain]
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
The 2018 Stock Incentive Plan [Member]
Represents The 2018 Stock Incentive Plan.
Award Type [Domain]
Award Type [Axis]
Net loss
Net loss
Net loss — basic
us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Accumulated amortization
us-gaap_FiniteLivedIntangibleAssetsNet
Intangibles, net
Intangibles, net
Restricted Stock Units (RSUs) [Member]
Intangibles, gross
Restricted Stock [Member]
Performance Shares [Member]
Share-Based Payment Arrangement [Member]
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
Currency translation adjustments
Software
Foreign Tax Jurisdiction, Other [Member]
Commitments and Contingencies Disclosure [Text Block]
us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Accumulated depreciation
Property and equipment, net
Property and equipment, net
Goodwill
Balance
Balance
us-gaap_PropertyPlantAndEquipmentGross
Gross property and equipment
Equipment
Office furniture and fixtures
Leasehold improvements
Cash flows from investing activities:
Earnings Per Share, Basic, by Common Class, Including Two-Class Method [Table]
us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
Other assets
Loss per share:
Earnings Per Share [Text Block]
us-gaap_IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities
Accounts payable and other accrued liabilities
us-gaap_IncomeTaxExpenseBenefit
Provision for income taxes
Total
dmrc_SharebasedCompensationArrangementBySharebasedPaymentAwardMinimumEmployeeSubscriptionRate
Share-Based Compensation Arrangement by Share-Based Payment Award, Minimum Employee Subscription Rate
The lowest percentage of annual salary that an employee is permitted to utilize with respect to the plan.
us-gaap_OperatingExpenses
Total operating expenses
Matching contributions
General and administrative
us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent
us-gaap_CashEquivalentsAtCarryingValue
Cash Equivalents, at Carrying Value
Cash and cash equivalents
Defined Contribution Plan Disclosures [Table Text Block]
Defined Contribution Plan [Table]
Stock-based compensation expense
us-gaap_LegalFees
Legal Fees
Unrealized loss on marketable securities, tax
Foreign currency translation adjustment, tax
Amendment Flag
Comprehensive loss:
us-gaap_ComprehensiveIncomeNetOfTax
Comprehensive loss
City Area Code
Use of Estimates, Policy [Policy Text Block]
New Accounting Pronouncements, Policy [Policy Text Block]
us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures
Forfeiture of restricted common stock
us-gaap_IncreaseDecreaseInContractWithCustomerLiability
Deferred revenue
us-gaap_SharesOutstanding
Balance (in shares)
Balance (in shares)
Common stock, shares outstanding (in shares)
Preferred stock, shares outstanding (in shares)
Current Fiscal Year End Date
Weighted-average discount rate
Document Fiscal Period Focus
Document Fiscal Year Focus
Consolidation, Policy [Policy Text Block]
Lease, Cost [Table Text Block]
Document Period End Date
Weighted-average remaining life (in years) (Year)
Entity File Number
Entity Emerging Growth Company
Document Type
Entity Small Business
Entity Shell Company
us-gaap_DividendsPreferredStockCash
Dividends, Preferred Stock, Cash
Document Information [Line Items]
Document Information [Table]
Service [Member]
us-gaap_AreaOfRealEstateProperty
Area of Real Estate Property (Square Foot)
Entity Public Float
Costs incurred
Severance Costs
Entity Filer Category
Entity Current Reporting Status
Entity Voluntary Filers
Entity Well-known Seasoned Issuer
us-gaap_LessorOperatingLeasePaymentsToBeReceived
Lessor, Operating Lease, Payment to be Received
Award Timing MNPI Disclosure [Text Block]
Valuation Technique, Monte Carlo Pricing Model [Member]
us-gaap_IncreaseDecreaseInAccountsReceivable
Trade accounts receivable
Entity wide revenue major customers percentage
Stock-based compensation
ecd_AwardTmgMnpiCnsdrdFlag
Award Timing MNPI Considered [Flag]
Entity Tax Identification Number
Entity Central Index Key
Insider Trading Policies and Procedures [Line Items]
Depreciation and amortization
Entity Registrant Name
ecd_InsiderTrdPoliciesProcAdoptedFlag
Insider Trading Policies and Procedures Adopted [Flag]
Entity [Domain]
Customer Concentration Risk [Member]
Legal Entity [Axis]
Capitalized Contract Cost [Table Text Block]
Entity Address, Address Line One
ecd_NonRule10b51ArrTrmntdFlag
Non-Rule 10b5-1 Arrangement Terminated [Flag]
Amortization expense
Entity Address, City or Town
ecd_Rule10b51ArrTrmntdFlag
Rule 10b5-1 Arrangement Terminated [Flag]
ecd_Rule10b51ArrAdoptedFlag
Rule 10b5-1 Arrangement Adopted [Flag]
Entity Address, Postal Zip Code
Entity Address, State or Province
ecd_NonRule10b51ArrAdoptedFlag
Non-Rule 10b5-1 Arrangement Adopted [Flag]
Concentration Risk Type [Axis]
Material Terms of Trading Arrangement [Text Block]
Concentration Risk Type [Domain]
us-gaap_StockRepurchasedDuringPeriodShares
Purchase of common stock (in shares)
Entity Common Stock, Shares Outstanding
Trading Arrangements, by Individual [Table]
us-gaap_StockRepurchasedDuringPeriodValue
Purchase of common stock
Revenue Benchmark [Member]
us-gaap_IncreaseDecreaseInOtherCurrentAssets
Other current assets
Accounts Receivable [Member]
Professional services and consultants
Trading Symbol
Concentration Risk Benchmark [Axis]
Concentration Risk Benchmark [Domain]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]
Local Phone Number
us-gaap_TableTextBlock
Notes Tables
Issuance of restricted common stock (in shares)
us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited
Forfeiture of restricted common stock (in shares)
Issuance of restricted common stock
Vesting of restricted stock units
Increase (decrease) in allowance for doubtful accounts
Sales and marketing
Issuance of common stock (in shares)
Stock Issued During Period, Shares, New Issues (in shares)
Other segment items
us-gaap_LiabilitiesAndStockholdersEquity
Total liabilities and shareholders’ equity
UNITED STATES
Issuance of common stock
Research, development and engineering
Accumulated deficit
Accumulated other comprehensive loss
Changes in operating assets and liabilities:
us-gaap_DisclosureTextBlockAbstract
Notes to Financial Statements
Subsequent Event [Member]
Long-term lease liabilities
Lease liabilities, long-term
Total minimum lease payments
Subsequent Event [Table]
Subsequent Event Type [Axis]
Lease liabilities, current
Subsequent Event Type [Domain]
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]
Retirement Benefits [Text Block]
Subsequent Events [Text Block]
Lease right of use assets
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue
Lessee, Operating Lease, Liability, to be Paid
Total lease payments
us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount
Imputed interest
us-gaap_DeferredIncomeTaxExpenseBenefit
Sub-total
us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1
Total stock-based compensation
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree
2028
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour
2029
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive
2030
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive
Thereafter
Label
us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
Label
us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
Label
us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths
2026
Label
us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo
2027
Valuation Approach and Technique [Axis]
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]
Valuation Approach and Technique [Domain]
us-gaap_PaymentsForRestructuring
Cash paid
Label
us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
Foreign Currency Transactions and Translations Policy [Policy Text Block]
Contract acquisition costs, long-term
Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block]
Stock-based compensation
us-gaap_ShareBasedCompensation
Other assets
Operating expenses:
Intangible Asset, Finite-Lived [Table]
Income Tax, Policy [Policy Text Block]
Assets, fair value
Trade accounts receivable, long-term
Schedule of Finite-Lived Intangible Assets [Table Text Block]
Research, Development, and Computer Software, Policy [Policy Text Block]
Research and Development Expense, Policy [Policy Text Block]
Depreciation and write-off of property and equipment
Intangible Assets Disclosure [Text Block]
Change in units based on performance expectations, weighted average grant date fair value (in dollars per share)
The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the units changed based on performance expectations.
us-gaap_SharesIssuedPricePerShare
Shares Issued, Price Per Share (in dollars per share)
us-gaap_AssetsCurrent
Total current assets
Share-Based Payment Arrangement [Policy Text Block]
Equity [Text Block]
Vesting of performance restricted stock units
Information pertaining to vested performance units.
Vesting of performance restricted stock units (in shares)
Information pertaining to vested performance shares.
Refundable tax credit
Information on refundable tax credit.
Common stock (par value $0.001 per share, 50,000 authorized, 21,901 and 21,495 shares issued and outstanding at December 31, 2025 and December 31, 2024, respectively)
Measurement Frequency [Axis]
Adjustments to reconcile net loss to net cash used in operating activities:
Measurement Frequency [Domain]
Fair Value, Recurring [Member]
Change in units based on performance expectations (in shares)
Represents the number of shares (or other type of equity) under an equity-based award plan, other than a stock option plan, that changed based on performance expectations.
Common stock, shares authorized (in shares)
Common Stock, Shares Authorized (in shares)
Common stock, shares issued (in shares)
Common stock, par value (in dollars per share)
Common Stock, Par or Stated Value Per Share (in dollars per share)
us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount
us-gaap_DeferredTaxAssetsValuationAllowance
Deferred Tax Assets, Valuation Allowance
Less valuation allowance
Statistical Measurement [Domain]
Lessee, Lease, Description [Table]
Cash paid for operating leases
Maximum [Member]
Commitments and Contingencies, Policy [Policy Text Block]
Minimum [Member]
Deferred Tax Asset, Valuation Allowance [Table]
Contract acquisition costs, current
Product and Service [Axis]
Other current assets
Product and Service [Domain]
us-gaap_DeferredTaxAssetsNet
Net deferred tax assets
Statistical Measurement [Axis]
Litigation Case [Axis]
Litigation Case [Domain]
Preferred stock (par value $0.001 per share, 2,500 authorized, 10 shares issued and outstanding at December 31, 2025 and December 31, 2024)
us-gaap_DeferredTaxAssetsLiabilitiesNet
Total net deferred tax assets and liabilities
Preferred stock, shares issued (in shares)
Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block]
Property, Plant and Equipment Disclosure [Text Block]
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]
Geographical [Axis]
Property, Plant and Equipment [Table Text Block]
us-gaap_DeferredTaxAssetsGross
Total gross deferred tax assets
Geographical [Domain]
Preferred stock, shares authorized (in shares)
Preferred Stock, Shares Authorized (in shares)
Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block]
Europe [Member]
Preferred stock, par value (in dollars per share)
Preferred Stock, Par or Stated Value Per Share (in dollars per share)
Fair Value, Inputs, Level 3 [Member]
Foreign currency gains (losses)
Fair Value Hierarchy and NAV [Domain]
Customer [Axis]
Fair Value, Inputs, Level 1 [Member]
Intangible asset differences
us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets
Customer [Domain]
Fair Value, Inputs, Level 2 [Member]
Fixed asset differences
us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment
Fair Value Hierarchy and NAV [Axis]
Amortization expense on acquired intangible assets
dmrc_AmortizationExpenseOnAcquiredIntangibleAssets
Amortization expense on acquired intangible assets.
Research and experimental costs
dmrc_DeferredTaxAssetsResearchAndExperimentalCosts
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from research and experimental costs.
Amortization of acquired intangible assets
Amortization of acquired intangible assets.
us-gaap_PropertyPlantAndEquipmentUsefulLife
Property, Plant and Equipment, Useful Life (Year)
Cash flows from operating activities:
Schedule of Segment Reporting Information, by Segment [Table Text Block]
Schedule of Segment Reporting Information, by Segment [Table]
Revenue [Policy Text Block]
Statement [Line Items]
Trade accounts receivable, current
Research and development tax deductions and credits, amount
Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to foreign research deductions and credits.
us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Allowance for doubtful accounts
Trade accounts receivable, net
Research and development tax deductions and credits, percent
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deduction and credits for foreign research.
us-gaap_NumberOfReportableSegments
Number of Reportable Segments
Stock based compensation
us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Additional paid-in capital
Accrued compensation
us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation
Customer A [Member]
Represents customer A.
Registered Direct Offering [Member]
Represents registered direct offering.
Revenue:
Marketable securities
us-gaap_MarketableSecuritiesCurrent
AOCI Attributable to Parent [Member]
Shareholders’ equity:
Other
us-gaap_DeferredTaxAssetsOtherTaxCarryforwards
Customer B [Member]
Represents customer B.
Property, Plant and Equipment [Table]
Long-Lived Tangible Asset [Axis]
Other income, net
Total other income, net
Segment Reporting Disclosure [Text Block]
Long-Lived Tangible Asset [Domain]
Schedule of Fair Value of Performance Stock Units Vested [Table Text Block]
Schedule of fair value of performance stock units vested.
Fair Value, by Balance Sheet Grouping [Table]
us-gaap_TemporaryEquityRedemptionPricePerShare
Temporary Equity, Redemption Price Per Share (in dollars per share)
Federal and state research and experimentation credits
us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch
us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal
Deferred Tax Assets, Operating Loss Carryforwards, State and Local
Current assets:
Fair Value Disclosures [Text Block]
us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic
Deferred Tax Assets, Operating Loss Carryforwards, Domestic
us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations
Cash and cash equivalents at beginning of period
Cash and cash equivalents at end of period
us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign
Deferred Tax Assets, Operating Loss Carryforwards, Foreign
Schedule of Fair Value of Restricted Stock Units Vested [Table Text Block]
Schedule of fair value of restricted stock units vested.
Effect of exchange rate on cash
Deferred tax assets:
Interest income
us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect
Net increase (decrease) in cash and cash equivalents
us-gaap_NetCashProvidedByUsedInFinancingActivities
Net cash provided by (used in) financing activities
us-gaap_Liabilities
Total liabilities
Commitments and contingencies (Note 17)
Director [Member]
Sale of Stock [Axis]
Sale of Stock [Domain]
us-gaap_OperatingIncomeLoss
Operating loss
us-gaap_ContractWithCustomerLiabilityRevenueRecognized
Contract with Customer, Liability, Revenue Recognized
us-gaap_NetCashProvidedByUsedInOperatingActivities
Net cash provided by (used in) operating activities
us-gaap_NetCashProvidedByUsedInInvestingActivities
Net cash provided by (used in) investing activities
us-gaap_DeferredTaxLiabilities
Total gross deferred tax liabilities
us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Intangible asset differences
us-gaap_GrossProfit
Gross profit
us-gaap_CostOfGoodsAndServicesSold
Total cost of revenue
us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedPatentCosts
Patent expenditures
dmrc_PolicyTable
Consolidation Items [Domain]
us-gaap_DeferredTaxLiabilitiesLeasingArrangements
ASC 842 - right of use assets
us-gaap_ContractWithCustomerLiability
Total
Schedule of Other Nonoperating Income (Expense) [Table Text Block]
Consolidation Items [Axis]
Marketable Securities, Policy [Policy Text Block]
Schedule of Share-Based Payment Award, Valuation Assumptions [Table Text Block]
Tabular disclosure of the significant assumptions used during the year to estimate the fair value of equity awards, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.
Concentration Risk, Credit Risk, Policy [Policy Text Block]
us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Fixed asset differences
Deferred tax liabilities:
Other Income and Other Expense Disclosure [Text Block]
Amortization expense on acquired intangible assets
Cost of revenue:
us-gaap_PaymentsForRepurchaseOfCommonStock
Purchase of common stock
us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Total
Retained Earnings [Member]
Revenue
Title and Position [Domain]
us-gaap_ProceedsFromIssuanceOfCommonStock
Proceeds from Issuance of Common Stock
us-gaap_CurrentStateAndLocalTaxExpenseBenefit
State
Title and Position [Axis]
us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
State
us-gaap_CurrentForeignTaxExpenseBenefit
Foreign
us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Foreign
Additional Paid-in Capital [Member]
Common Stock [Member]
us-gaap_CurrentFederalTaxExpenseBenefit
Federal
us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Federal
Preferred Stock [Member]
Deferred:
Equity Components [Axis]
Equity Component [Domain]
Current:
Stock, Class of Stock [Table]
us-gaap_CurrentIncomeTaxExpenseBenefit
Sub-total
us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Year)
us-gaap_RevenueRemainingPerformanceObligation
Revenue, Remaining Performance Obligation, Amount
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]
Loss before income taxes
Loss before income taxes
ICFR Auditor Attestation Flag
His Majesty's Revenue and Customs (HMRC) [Member]
State and Local Jurisdiction [Member]
Income Tax Authority, Name [Axis]
Income Tax Authority, Name [Domain]
Income Tax Jurisdiction [Axis]
Income Tax Jurisdiction [Domain]
Disaggregation of Revenue [Table Text Block]
Domestic Tax Jurisdiction [Member]
Foreign Tax Jurisdiction [Member]
us-gaap_RepaymentsOfLongTermDebt
Repayment of loans
Revenue Recognition, Milestone Method [Table]
Revenue from Contract with Customer [Text Block]
Income Tax, Examination [Table]
Document Annual Report
Former Corporate Office in Beaverton, Oregon [Member]
Represents Former corporate office in Beaverton, Oregon.
NOLs surrendered for refundable tax credit
Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to NOL surrendered for tax credit refundable amount.
Cash and Cash Equivalents, Policy [Policy Text Block]
Change in Unrecognized Tax Benefit, Reasonably Possible [Table]
Entity Incorporation, State or Country Code
General and Administrative Expense [Member]
us-gaap_UnrecognizedTaxBenefits
Beginning balance
Ending balance
Accounting Policies [Abstract]
us-gaap_OpenTaxYear
Open Tax Year
Document Transition Report
Document Financial Statement Error Correction [Flag]
NOLs surrendered for refundable tax credit, percent
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to NOL surrendered for tax credit refundable amount.
Entity Interactive Data Current
Selling and Marketing Expense [Member]
Addition for prior year positions
Security Exchange Name
us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions
Reduction for prior year positions
Addition for current year tax positions
Title of 12(b) Security
Software and hardware
Amount charged to software and hardware expense for the period.
Cost of Sales [Member]
Research and Development Expense [Member]
dmrc_StockCompensationExpenseExcludingCostOfGoodAndServiceSold
Stock-based compensation
Amount of expense for stock based compensation. Excludes compensation cost in cost of good and service sold.
Cash compensation
Amount of cash expense for compensation. Excludes compensation cost in cost of good and service sold.
Statement of Income Location, Balance [Axis]
Statement of Income Location, Balance [Domain]
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
Accounts and Financing Receivables [Table]
Auditor Name
Auditor Firm ID
Auditor Location
us-gaap_TaxCreditCarryforwardAmount
Tax Credit Carryforward, Amount
Supplier Finance Program [Table]
Research Tax Credit Carryforward [Member]
Anti-dilutive shares due to net loss (in shares)
Weighted average shares outstanding — diluted (in shares)
Weighted average shares outstanding — diluted (in shares)
Tax Credit Carryforward [Axis]
Tax Credit Carryforward, Name [Domain]
Non-US [Member]
Statement [Table]
Statement of Financial Position [Abstract]
Diluted loss per share (in dollars per share)
Loss per share — diluted (in dollars per share)
Weighted average shares outstanding — basic (in shares)
Weighted average shares outstanding — basic (in shares)
Stock compensation expense windfall (shortfall), percent
Accounts Payable and Accrued Liabilities Disclosure [Text Block]
Other, percent
Cost of revenue
us-gaap_EffectiveIncomeTaxRateContinuingOperations
Effective Income Tax Rate Reconciliation, Percent
Total, percent
Basic loss per share (in dollars per share)
Loss per share — basic (in dollars per share)
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block]
Change in valuation allowance, percent
Statement of Cash Flows [Abstract]
Lease Contractual Term [Domain]
Statement of Stockholders' Equity [Abstract]
Lease Contractual Term [Axis]
Income Statement [Abstract]
us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Other comprehensive income (loss)
Revenue from External Customers by Geographic Areas [Table Text Block]
us-gaap_RestructuringReserve
Balance
Balance
Long-Lived Assets by Geographic Areas [Table Text Block]
Schedule of Accounts Payable and Accrued Liabilities [Table Text Block]
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]
Investments Classified by Contractual Maturity Date [Table Text Block]
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther
Other, percent
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
Accounting Standards Update and Change in Accounting Principle [Table]
Offsetting Liabilities [Table]
Finite-Lived Intangible Assets Amortization Expense [Table Text Block]
dmrc_SharebasedCompensationArrangementBySharebasedPaymentAwardOfferingWindow
Share-Based Compensation Arrangement by Share-Based Payment Award, Offering Window (Month)
Period of offering window to purchase shares.
Restructuring and Related Activities Disclosure [Text Block]
State income taxes, net of federal tax benefit, percent
dmrc_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePricePurchasePeriod
Share-Based Compensation Arrangement by Share-Based Payment Award, Purchase Price, Purchase Period (Month)
Purchase period used to calculate purchase price that participants pay for shares.
Other Commitments [Table]
Restructuring and Related Costs [Table Text Block]
Statutory rate differential, percent
dmrc_StockIssuedDuringPeriodValueRestrictedStockAwardVested
Vesting of restricted stock units
Stock issued during period value restricted stock award vested.
Restructuring Cost [Table]
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
dmrc_StockIssuedDuringPeriodSharesRestrictedStockAwardVested
Vesting of restricted stock units (in shares)
Stock issued during period shares restricted stock award vested.
Asset Acquisition, Contingent Consideration, Liability, Current
Amortization and write-off of other intangible assets
Amortization and write-off of other intangible assets.
The 2025 Employee Stock Purchase Plan [Member]
Represents The 2025 Employee Stock Purchase Plan.
Supplemental schedule of non-cash investing activities:
us-gaap_IncomeTaxReconciliationOtherAdjustments
Other, amount
Cash flows from financing activities:
Income taxes computed at U.S. statutory rates, percent
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent
Subscription [Member]
Related to subscription.
Supplemental schedule of non-cash financing activities:
Other long-term liabilities
dmrc_StockRepurchasedDuringPeriodValue1
Purchase of common stock
Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.
dmrc_LesseeOperatingLeasePeriodOfAbatement
Lessee, Operating Lease, Period of Abatement (Month)
Period of abatement on operating lease of the lessee.
us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Change in valuation allowance, amount
us-gaap_EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitAmount
Stock compensation expense windfall (shortfall), amount
Weighted Average Fair Value of Purchase Rights (in dollars per share)
dmrc_SharebasedCompensationArrangementBySharebasedPaymentAwardWeightedAverageFairValueOfPurchaseRights
Per share weighted-average fair value of purchase rights under share-based payment arrangement.
dmrc_IncreaseDecreaseInLeaseLiabilityAndOtherLongTermLiabilities
Lease liability and other long-term liabilities
The amount of increase (decrease) in lease liability and other long term liabilities.
Weighted Average Purchase Price (in dollars per share)
dmrc_SharebasedCompensationArrangementBySharebasedPaymentAwardPerShareWeightedAveragePurchasePrice
Per share weighted-average price paid for shares purchased under share-based payment arrangement.
Issuance of common stock, net of issuance costs
Proceeds from (payments for) issuance of common stock.
Property and equipment and patent costs in accounts payable
Change in capital expenditures incurred but not yet paid.
dmrc_EffectiveIncomeTaxRateReconciliationTaxCreditResearchAndDevelopmentPercent
Research and development tax credits, percent
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to research and development tax credit.
dmrc_EffectiveIncomeTaxRateReconciliationTaxCreditResearchAndDevelopmentAmount
Research and development tax credits, amount
Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to research and development tax credit.
Change in unrecognized tax benefits, percent
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to change in unrecognized tax benefits.
dmrc_EffectiveIncomeTaxRateReconciliationChangeInUnrecognizedTaxBenefitsAmount
Change in unrecognized tax benefits, amount
Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to change in unrecognized tax benefits.
Redeemable Preferred Stock [Member]
Amortization of lease right of use assets under operating leases
Deferred revenue, long-term
us-gaap_StockholdersEquity
Total shareholders’ equity
Balance
Balance
us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther
Other, amount
Class of Stock [Axis]
Class of Stock [Domain]
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Corporate Headquarters in Beaverton, Oregon [Member]
Represents the corporate headquarters in Beaverton, Oregon.
Operating Segments [Member]
us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
State income taxes, net of federal tax benefit, amount
us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Statutory rate differential, amount