Document And Entity Information Statistical Measurement [Axis] Note To Financial Statement Details Textual Interest income and other income, net Significant Accounting Policies Warrant Liability [Member] Related to warrant liability. Exercised, number of options (in shares) Note 2 - Investments and Fair Value Measurement RSU's, ESPP, and Employee Stock Options [Member] Represents the antidilutive securities types; restricted stock units, employee stock purchase plan, and employee stock options. ecd_NonRule10b51ArrTrmntdFlag Non-Rule 10b5-1 Arrangement Terminated [Flag] Note 3 - Discontinued Operations Issuance of common stock upon vesting of restricted stock units, net of shares withheld for employee taxes (in shares) tlph_DisposalGroupIncludingDiscontinuedOperationNetAssets Net liabilities of discontinued operations Amount classified as net assets attributable to disposal group held for sale or disposed of. ecd_NonRule10b51ArrAdoptedFlag Non-Rule 10b5-1 Arrangement Adopted [Flag] Note 7 - Warrants Trading Arrangements, by Individual [Table] Note 8 - Stock-based Compensation Material Terms of Trading Arrangement [Text Block] Note 9 - Net Loss Per Share of Common Stock Note 10 - Segment Information Financial Instrument [Axis] Note 2 - 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Share-Based Payment Arrangement [Text Block] Location, Statement of Income, Balance [Axis] July 2023 Prefunded Warrants [Member] Represents the July 2023 prefunded warrants. January 2024 Prefunded Warrants [Member] Represents the January 2024 prefunded warrants. 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Warrant [Member] Warrant liability Warrants and Rights Outstanding dei_DocumentType Document Type Asset Class [Axis] Department of Defense [Member] Represents department of defense. Document Information [Line Items] dei_DocumentQuarterlyReport Document Quarterly Report us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod Forfeited, number of options (in shares) Document Information [Table] us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod Expired, number of options (in shares) us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant Antidilutive securities (in shares) Investments and Fair Value Measurement Disclosure [Text Block] The disclosure of investments and fair value measurement. 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Fair Value Hierarchy and NAV [Axis] March 31, 2026 Common Stock, Shares, Issued (in shares) Net (loss) income per share attributable to stockholders: Common Stock, Shares, Outstanding (in shares) Award Type [Domain] Common Stock, Shares Authorized (in shares) Shares used in computing net loss per share of common stock, basic and diluted – See Note 9 (in shares) Total cash, cash equivalents and short-term investments tlph_CashCashEquivalentsAndShorttermInvestmentsFairValue Represents fair value of cash, cash equivalents and short-term investments. Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] us-gaap_EarningsPerShareBasic Basic and diluted loss per share (in dollars per share) Earnings Per Share, Basic, by Common Class, Including Two-Class Method [Table] Common stock, $0.001 par value—200,000,000 shares authorized as of March 31, 2026 and December 31, 2025; 50,049,824 and 49,328,097 shares issued and outstanding as of March 31, 2026 and December 31, 2025, respectively us-gaap_ProceedsFromIssuanceOrSaleOfEquity Proceeds from Issuance or Sale of Equity Cash, Cash Equivalent, and Investment [Table Text Block] us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) Outstanding, warrants, exercise price (in dollars per share) Outstanding and exercisable, warrants, exercise price (in dollars per share) Accounts payable In-process research and development asset us-gaap_PolicyTextBlockAbstract Accounting Policies us-gaap_DisclosureTextBlockAbstract Notes to Financial Statements Prefund Warrants [Member] Represents prefund warrants. us-gaap_TableTextBlock Notes Tables Pre-funded Warrants [Member] The pre-funded warrants. Document Fiscal Period Focus Net proceeds from issuance of common stock in connection with exercise of pre-funded warrants Customer [Domain] Document Fiscal Year Focus Amendment Flag Disposal Group Classification [Axis] Disposal Group Classification [Domain] Common Stock [Member] Short-term investments Accrued and other liabilities dei_DocumentPeriodEndDate Document Period End Date Granted, number of options (in shares) Legal Entity [Axis] dei_EntityFileNumber Entity File Number March 31, 2026 (Year) dei_EntityTaxIdentificationNumber Entity Tax Identification Number Entity [Domain] Entity Central Index Key dei_EntityRegistrantName Entity Registrant Name dei_EntityCurrentReportingStatus Entity Current Reporting Status dei_EntityIncorporationStateCountryCode Entity Incorporation, State or Country Code Vested and expected to vest— March 31, 2026 (Year) Development and clinical trial expense tlph_DevelopmentAndClinicalTrialExpense Amount of development and clinical trial expense. Current Fiscal Year End Date U.S government agency securities, amortized cost us-gaap_USGovernmentAgenciesSecuritiesAtCarryingValue Research and development dei_EntityFilerCategory Entity Filer Category dei_EntityShellCompany Entity Shell Company dei_EntityEmergingGrowthCompany Entity Emerging Growth Company dei_EntitySmallBusiness Entity Small Business U.S. government agency securities us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis us-gaap_OperatingIncomeLoss Loss from operations Cash and Cash Equivalents [Domain] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Cash, amortized cost us-gaap_Cash Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block] Class of Warrant or Right [Table] Operating costs and expenses: Other segment income, net(b) us-gaap_SegmentReportingOtherItemAmount us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings Gain (loss) on change in fair value of December 2022 Common Stock Warrants liability dei_EntityAddressStateOrProvince Entity Address, State or Province Loss Contingencies [Table] Statement of Stockholders' Equity [Abstract] dei_EntityAddressCityOrTown Entity Address, City or Town Accumulated deficit dei_EntityAddressAddressLine1 Entity Address, Address Line One Class of Warrant or Right [Axis] Statement of Cash Flows [Abstract] Class of Warrant or Right [Domain] dei_CityAreaCode City Area Code Amended ESPP [Member] Represents Amended ESPP. dei_LocalPhoneNumber Local Phone Number dei_EntityAddressPostalZipCode Entity Address, Postal Zip Code Stockholders’ Equity: dei_Security12bTitle Title of 12(b) Security Equity Components [Axis] dei_SecurityExchangeName Security Exchange Name dei_TradingSymbol Trading Symbol Class of Stock [Axis] Equity Component [Domain] U.S. government agency securities us-gaap_AvailableForSaleSecuritiesDebtSecurities Fair Value, Inputs, Level 2 [Member] us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights Class of Warrant or Right, Number of Securities Called by Warrants or Rights Fair Value, Inputs, Level 3 [Member] Fair Value, Inputs, Level 1 [Member] Equity [Text Block] dei_EntityCommonStockSharesOutstanding Entity Common Stock, Shares Outstanding (in shares) Additional Paid-in Capital [Member] us-gaap_ClassOfWarrantOrRightOutstanding Class of Warrant or Right, Outstanding Outstanding, warrants (in shares) Outstanding and exercisable, warrants (in shares) Retained Earnings [Member] Earnings Per Share [Text Block] Warrants Disclosure [Text Block] The disclosure of warrants. us-gaap_ProceedsFromDebtNetOfIssuanceCosts Proceeds from Debt, Net of Issuance Costs Granted, warrants, exercise price (in dollars per share) Represents the exercise price of warrants or rights issued during the period. Granted, warrants (in shares) Represents the number of warrants or rights issued during the period. September 2025 Prefunded Warrants [Member] Represents the September 2025 Prefunded Warrants. Liability related to the sale of future payments Amount of liability related ot the sale of future payments Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table] Sale of Stock [Axis] Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block] Proceeds from maturities of investments Common Stock, Par or Stated Value Per Share (in dollars per share) Stock-based compensation Basis of Accounting, Policy [Policy Text Block] Net proceeds from issuance of common stock and pre-funded warrants in connection with private placement offerings Equity impact of the value of new common stock and warrants issued during the period. Net proceeds from issuance of common stock and pre-funded warrants in connection with private placement offerings (in shares) Number of new common stock and warrants issued during the period. Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] Sale of Stock [Domain] Share-Based Payment Arrangement, Option, Activity [Table Text Block] us-gaap_Assets Total assets Cash and cash equivalents Liquidity and Going Concern [Policy Text Block] The disclosure for liquidity and going concern accounting policies. Total cash, cash equivalents and short-term investments us-gaap_CashCashEquivalentsAndShortTermInvestments Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] us-gaap_DeferredOfferingCosts Deferred Offering Costs Current Liabilities: Net income from discontinued operations – See Note 3 Discontinued operations Cash [Member] us-gaap_LiabilitiesCurrent Total current liabilities Other general and administrative expense(a) us-gaap_OtherSellingGeneralAndAdministrativeExpense Customer [Axis] Asset Class [Domain] Net income from discontinued operations Amount after tax of income (loss) from a discontinued operation attributable to the parent before interest income (expense). Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal. Disposal Group Name [Domain] Sale of Future Payments [Text Block] Disclosure for the sale of future payments. tlph_PrivatePlacementCovenantToTriggerSalePatientsEnrolled Private Placement, Covenant to Trigger Sale, Patients Enrolled Number of patients enrolled to trigger sale. tlph_ClassOfWarrantOrRightIssuedDuringPeriodPricePerWarrant Class of Warrant or Right, Issued During Period, Price Per Warrant Price per warrant issued during period. Change in estimated net liabilities of discontinued operations Amount of change in estimated net liabilities of discontinues operation. Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table Text Block] Disposal Group Name [Axis] us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration Disposal Group, Including Discontinued Operation, Consideration Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Additional paid-in capital tlph_ClassOfWarrantOrRightExercisableDuringPeriodExercisePrice Class of Warrant or Right, Exercisable During Period, Exercise Price (in dollars per share) Exercise price per share of warrants or rights exercisable during period. tlph_ClassOfWarrantsOrRightExercisable Class of Warrants or Right, Exercisable Class of Warrants or Right, Exercisable (in shares) The number of warrants or rights exercisable. us-gaap_StockholdersEquity Total stockholders’ equity Balance Balance us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue Forfeited, weighted average grant date fair value (in dollars per share) Prepaid expenses and other current assets Common Warrants [Member] Relating to common warrants. tlph_DisposalGroupIncludingDiscontinuedOperationPercentageOfRoyaltyOnCommercialSales Disposal Group, Including Discontinued Operation, Percentage of Royalty on Commercial Sales Amount of royalty on commercial sales as a percentage for the disposal of assets and liabilities, including discontinued operation. tlph_ProceedsFromSaleOfReceivables Proceeds From Sale of Receivables Represents the cash inflow from sale of receivables. us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1 Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) Issuance of common stock upon ESPP purchase XOMA [Member] Relating to XOMA. Stock, Class of Stock [Table] us-gaap_PaymentsToAcquireShortTermInvestments Purchase of investments Nature of Operation, Product Information, Concentration of Risk [Table] Money market funds, amortized cost us-gaap_MoneyMarketFundsAtCarryingValue Current Assets: Money Market Funds [Member] tlph_DisposalGroupIncludingDiscontinuedOperationMaximumAmountInSalesbasedMilestone Disposal Group, Including Discontinued Operation, Maximum Amount in Sales-based Milestone Maximum amount in sales-based milestone for the disposal of assets and liabilities, including discontinued operation. us-gaap_AssetsCurrent Total current assets Issuance of common stock upon vesting of restricted stock units, net of shares withheld for employee taxes Issuance of common stock upon ESPP purchase (in shares) Fair Value, Recurring and Nonrecurring [Table] ecd_Rule10b51ArrTrmntdFlag Rule 10b5-1 Arrangement Terminated [Flag] Revenue Revenue ecd_Rule10b51ArrAdoptedFlag Rule 10b5-1 Arrangement Adopted [Flag] Commitments and Contingencies us-gaap_StockIssuedDuringPeriodSharesNewIssues Stock Issued During Period, Shares, New Issues Restricted Stock Units (RSUs) [Member]