3.23.2 html 298 424 1 false 120 0 false 7 false false R1.htm 0000001 - Document - Cover Sheet http://transphormusa.com/role/Cover Cover Cover 1 false false R2.htm 0000002 - Document - Audit Information Sheet http://transphormusa.com/role/AuditInformation Audit Information Cover 2 false false R3.htm 0000003 - Statement - Consolidated Balance Sheets Sheet http://transphormusa.com/role/ConsolidatedBalanceSheets Consolidated Balance Sheets Statements 3 false false R4.htm 0000004 - Statement - Consolidated Balance Sheets (Parenthetical) Sheet http://transphormusa.com/role/ConsolidatedBalanceSheetsParenthetical Consolidated Balance Sheets (Parenthetical) Statements 4 false false R5.htm 0000005 - Statement - Consolidated Statements of Operations Sheet http://transphormusa.com/role/ConsolidatedStatementsofOperations Consolidated Statements of Operations Statements 5 false false R6.htm 0000006 - Statement - Consolidated Statements of Comprehensive Loss Sheet http://transphormusa.com/role/ConsolidatedStatementsofComprehensiveLoss Consolidated Statements of Comprehensive Loss Statements 6 false false R7.htm 0000007 - Statement - Consolidated Statements of Changes in Stockholders??? Equity (Deficit) Sheet http://transphormusa.com/role/ConsolidatedStatementsofChangesinStockholdersEquityDeficit Consolidated Statements of Changes in Stockholders??? Equity (Deficit) Statements 7 false false R8.htm 0000008 - Statement - Consolidated Statements of Cash Flows Sheet http://transphormusa.com/role/ConsolidatedStatementsofCashFlows Consolidated Statements of Cash Flows Statements 8 false false R9.htm 0000009 - Disclosure - Business Sheet http://transphormusa.com/role/Business Business Notes 9 false false R10.htm 0000010 - Disclosure - Summary of Significant Accounting Policies Sheet http://transphormusa.com/role/SummaryofSignificantAccountingPolicies Summary of Significant Accounting Policies Notes 10 false false R11.htm 0000011 - Disclosure - Nexperia Arrangement Sheet http://transphormusa.com/role/NexperiaArrangement Nexperia Arrangement Notes 11 false false R12.htm 0000012 - Disclosure - Revenue Sheet http://transphormusa.com/role/Revenue Revenue Notes 12 false false R13.htm 0000013 - Disclosure - Concentration of Credit Risk and Significant Customers Sheet http://transphormusa.com/role/ConcentrationofCreditRiskandSignificantCustomers Concentration of Credit Risk and Significant Customers Notes 13 false false R14.htm 0000014 - Disclosure - Inventory Sheet http://transphormusa.com/role/Inventory Inventory Notes 14 false false R15.htm 0000015 - Disclosure - Property and Equipment Sheet http://transphormusa.com/role/PropertyandEquipment Property and Equipment Notes 15 false false R16.htm 0000016 - Disclosure - Intangible Assets Sheet http://transphormusa.com/role/IntangibleAssets Intangible Assets Notes 16 false false R17.htm 0000017 - Disclosure - Investment in Joint Venture Sheet http://transphormusa.com/role/InvestmentinJointVenture Investment in Joint Venture Notes 17 false false R18.htm 0000018 - Disclosure - Leases Sheet http://transphormusa.com/role/Leases Leases Notes 18 false false R19.htm 0000019 - Disclosure - Debts Sheet http://transphormusa.com/role/Debts Debts Notes 19 false false R20.htm 0000020 - Disclosure - Commitments and Contingencies Sheet http://transphormusa.com/role/CommitmentsandContingencies Commitments and Contingencies Notes 20 false false R21.htm 0000021 - Disclosure - Stockholders' Equity Sheet http://transphormusa.com/role/StockholdersEquity Stockholders' Equity Notes 21 false false R22.htm 0000022 - Disclosure - Stock-Based Compensation Sheet http://transphormusa.com/role/StockBasedCompensation Stock-Based Compensation Notes 22 false false R23.htm 0000023 - Disclosure - Fair Value Measurements Sheet http://transphormusa.com/role/FairValueMeasurements Fair Value Measurements Notes 23 false false R24.htm 0000024 - Disclosure - 401(k) Savings Plan Sheet http://transphormusa.com/role/A401kSavingsPlan 401(k) Savings Plan Notes 24 false false R25.htm 0000025 - Disclosure - Income Taxes Sheet http://transphormusa.com/role/IncomeTaxes Income Taxes Notes 25 false false R26.htm 0000026 - Disclosure - Related Party Transactions Sheet http://transphormusa.com/role/RelatedPartyTransactions Related Party Transactions Notes 26 false false R27.htm 0000027 - Disclosure - Subsequent Events Sheet http://transphormusa.com/role/SubsequentEvents Subsequent Events Notes 27 false false R28.htm 0000028 - Disclosure - Summary of Significant Accounting Policies (Policies) Sheet http://transphormusa.com/role/SummaryofSignificantAccountingPoliciesPolicies Summary of Significant Accounting Policies (Policies) Policies http://transphormusa.com/role/SummaryofSignificantAccountingPolicies 28 false false R29.htm 0000029 - Disclosure - Revenue (Tables) Sheet http://transphormusa.com/role/RevenueTables Revenue (Tables) Tables http://transphormusa.com/role/Revenue 29 false false R30.htm 0000030 - Disclosure - Concentration of Credit Risk and Significant Customers (Tables) Sheet http://transphormusa.com/role/ConcentrationofCreditRiskandSignificantCustomersTables Concentration of Credit Risk and Significant Customers (Tables) Tables http://transphormusa.com/role/ConcentrationofCreditRiskandSignificantCustomers 30 false false R31.htm 0000031 - Disclosure - Inventory (Tables) Sheet http://transphormusa.com/role/InventoryTables Inventory (Tables) Tables http://transphormusa.com/role/Inventory 31 false false R32.htm 0000032 - Disclosure - Property and Equipment (Tables) Sheet http://transphormusa.com/role/PropertyandEquipmentTables Property and Equipment (Tables) Tables http://transphormusa.com/role/PropertyandEquipment 32 false false R33.htm 0000033 - Disclosure - Intangible Assets (Tables) Sheet http://transphormusa.com/role/IntangibleAssetsTables Intangible Assets (Tables) Tables http://transphormusa.com/role/IntangibleAssets 33 false false R34.htm 0000034 - Disclosure - Investment in Joint Venture (Tables) Sheet http://transphormusa.com/role/InvestmentinJointVentureTables Investment in Joint Venture (Tables) Tables http://transphormusa.com/role/InvestmentinJointVenture 34 false false R35.htm 0000035 - Disclosure - Leases (Tables) Sheet http://transphormusa.com/role/LeasesTables Leases (Tables) Tables http://transphormusa.com/role/Leases 35 false false R36.htm 0000036 - Disclosure - Debts (Tables) Sheet http://transphormusa.com/role/DebtsTables Debts (Tables) Tables http://transphormusa.com/role/Debts 36 false false R37.htm 0000037 - Disclosure - Stockholders' Equity (Tables) Sheet http://transphormusa.com/role/StockholdersEquityTables Stockholders' Equity (Tables) Tables http://transphormusa.com/role/StockholdersEquity 37 false false R38.htm 0000038 - Disclosure - Stock-Based Compensation (Tables) Sheet http://transphormusa.com/role/StockBasedCompensationTables Stock-Based Compensation (Tables) Tables http://transphormusa.com/role/StockBasedCompensation 38 false false R39.htm 0000039 - Disclosure - Fair Value Measurements (Tables) Sheet http://transphormusa.com/role/FairValueMeasurementsTables Fair Value Measurements (Tables) Tables http://transphormusa.com/role/FairValueMeasurements 39 false false R40.htm 0000040 - Disclosure - Income Taxes (Tables) Sheet http://transphormusa.com/role/IncomeTaxesTables Income Taxes (Tables) Tables http://transphormusa.com/role/IncomeTaxes 40 false false R41.htm 0000041 - Disclosure - Related Party Transactions (Tables) Sheet http://transphormusa.com/role/RelatedPartyTransactionsTables Related Party Transactions (Tables) Tables http://transphormusa.com/role/RelatedPartyTransactions 41 false false R42.htm 0000042 - Disclosure - Business (Details) Sheet http://transphormusa.com/role/BusinessDetails Business (Details) Details http://transphormusa.com/role/Business 42 false false R43.htm 0000043 - Disclosure - Summary of Significant Accounting Policies (Details) Sheet http://transphormusa.com/role/SummaryofSignificantAccountingPoliciesDetails Summary of Significant Accounting Policies (Details) Details http://transphormusa.com/role/SummaryofSignificantAccountingPoliciesPolicies 43 false false R44.htm 0000044 - Disclosure - Nexperia Arrangement (Details) Sheet http://transphormusa.com/role/NexperiaArrangementDetails Nexperia Arrangement (Details) Details http://transphormusa.com/role/NexperiaArrangement 44 false false R45.htm 0000045 - Disclosure - Revenue - Schedule of disaggregation of revenue (Details) Sheet http://transphormusa.com/role/RevenueScheduleofdisaggregationofrevenueDetails Revenue - Schedule of disaggregation of revenue (Details) Details 45 false false R46.htm 0000046 - Disclosure - Revenue - Narrative (Details) Sheet http://transphormusa.com/role/RevenueNarrativeDetails Revenue - Narrative (Details) Details 46 false false R47.htm 0000047 - Disclosure - Concentration of Credit Risk and Significant Customers (Details) Sheet http://transphormusa.com/role/ConcentrationofCreditRiskandSignificantCustomersDetails Concentration of Credit Risk and Significant Customers (Details) Details http://transphormusa.com/role/ConcentrationofCreditRiskandSignificantCustomersTables 47 false false R48.htm 0000048 - Disclosure - Inventory (Details) Sheet http://transphormusa.com/role/InventoryDetails Inventory (Details) Details http://transphormusa.com/role/InventoryTables 48 false false R49.htm 0000049 - Disclosure - Property and Equipment (Details) Sheet http://transphormusa.com/role/PropertyandEquipmentDetails Property and Equipment (Details) Details http://transphormusa.com/role/PropertyandEquipmentTables 49 false false R50.htm 0000050 - Disclosure - Intangible Assets - Finite-lived intangible assets (Details) Sheet http://transphormusa.com/role/IntangibleAssetsFinitelivedintangibleassetsDetails Intangible Assets - Finite-lived intangible assets (Details) Details 50 false false R51.htm 0000051 - Disclosure - Intangible Assets - Estimated future amortization expense (Details) Sheet http://transphormusa.com/role/IntangibleAssetsEstimatedfutureamortizationexpenseDetails Intangible Assets - Estimated future amortization expense (Details) Details 51 false false R52.htm 0000052 - Disclosure - Investment in Joint Venture - Narrative (Details) Sheet http://transphormusa.com/role/InvestmentinJointVentureNarrativeDetails Investment in Joint Venture - Narrative (Details) Details 52 false false R53.htm 0000053 - Disclosure - Investment in Joint Venture - Investment activities (Details) Sheet http://transphormusa.com/role/InvestmentinJointVentureInvestmentactivitiesDetails Investment in Joint Venture - Investment activities (Details) Details 53 false false R54.htm 0000054 - Disclosure - Investment in Joint Venture - Summarized financial information (Details) Sheet http://transphormusa.com/role/InvestmentinJointVentureSummarizedfinancialinformationDetails Investment in Joint Venture - Summarized financial information (Details) Details 54 false false R55.htm 0000055 - Disclosure - Leases - Narrative (Details) Sheet http://transphormusa.com/role/LeasesNarrativeDetails Leases - Narrative (Details) Details 55 false false R56.htm 0000056 - Disclosure - Leases - Schedule of lease assets and liabilities (Details) Sheet http://transphormusa.com/role/LeasesScheduleofleaseassetsandliabilitiesDetails Leases - Schedule of lease assets and liabilities (Details) Details 56 false false R57.htm 0000057 - Disclosure - Leases - Schedule of future minimum operating lease commitments (Details) Sheet http://transphormusa.com/role/LeasesScheduleoffutureminimumoperatingleasecommitmentsDetails Leases - Schedule of future minimum operating lease commitments (Details) Details 57 false false R58.htm 0000058 - Disclosure - Leases - Schedule of operating lease maturity (Details) Sheet http://transphormusa.com/role/LeasesScheduleofoperatingleasematurityDetails Leases - Schedule of operating lease maturity (Details) Details 58 false false R59.htm 0000059 - Disclosure - Debts - Narrative (Details) Sheet http://transphormusa.com/role/DebtsNarrativeDetails Debts - Narrative (Details) Details 59 false false R60.htm 0000060 - Disclosure - Debts - Maturities schedule (Details) Sheet http://transphormusa.com/role/DebtsMaturitiesscheduleDetails Debts - Maturities schedule (Details) Details 60 false false R61.htm 0000061 - Disclosure - Commitments and Contingencies (Details) Sheet http://transphormusa.com/role/CommitmentsandContingenciesDetails Commitments and Contingencies (Details) Details http://transphormusa.com/role/CommitmentsandContingencies 61 false false R62.htm 0000062 - Disclosure - Stockholders' Equity - Narrative (Details) Sheet http://transphormusa.com/role/StockholdersEquityNarrativeDetails Stockholders' Equity - Narrative (Details) Details 62 false false R63.htm 0000063 - Disclosure - Stockholders' Equity - Reserved common stock (Details) Sheet http://transphormusa.com/role/StockholdersEquityReservedcommonstockDetails Stockholders' Equity - Reserved common stock (Details) Details 63 false false R64.htm 0000064 - Disclosure - Stockholders' Equity - Common stock warrants (Details) Sheet http://transphormusa.com/role/StockholdersEquityCommonstockwarrantsDetails Stockholders' Equity - Common stock warrants (Details) Details 64 false false R65.htm 0000065 - Disclosure - Stockholders' Equity - Warrants (Details) Sheet http://transphormusa.com/role/StockholdersEquityWarrantsDetails Stockholders' Equity - Warrants (Details) Details 65 false false R66.htm 0000066 - Disclosure - Stock-Based Compensation - Narrative (Details) Sheet http://transphormusa.com/role/StockBasedCompensationNarrativeDetails Stock-Based Compensation - Narrative (Details) Details 66 false false R67.htm 0000067 - Disclosure - Stock-Based Compensation - Schedule of option activity (Details) Sheet http://transphormusa.com/role/StockBasedCompensationScheduleofoptionactivityDetails Stock-Based Compensation - Schedule of option activity (Details) Details 67 false false R68.htm 0000068 - Disclosure - Stock-Based Compensation - Fair value assumptions (Details) Sheet http://transphormusa.com/role/StockBasedCompensationFairvalueassumptionsDetails Stock-Based Compensation - Fair value assumptions (Details) Details 68 false false R69.htm 0000069 - Disclosure - Stock-Based Compensation - Restricted stock (Details) Sheet http://transphormusa.com/role/StockBasedCompensationRestrictedstockDetails Stock-Based Compensation - Restricted stock (Details) Details 69 false false R70.htm 0000070 - Disclosure - Stock-Based Compensation - Share-based payment arrangement, expense (Details) Sheet http://transphormusa.com/role/StockBasedCompensationSharebasedpaymentarrangementexpenseDetails Stock-Based Compensation - Share-based payment arrangement, expense (Details) Details 70 false false R71.htm 0000071 - Disclosure - Stock-Based Compensation - Unrecognized stock-based compensation (Details) Sheet http://transphormusa.com/role/StockBasedCompensationUnrecognizedstockbasedcompensationDetails Stock-Based Compensation - Unrecognized stock-based compensation (Details) Details 71 false false R72.htm 0000072 - Disclosure - Fair Value Measurements - Fair value measurement inputs (Details) Sheet http://transphormusa.com/role/FairValueMeasurementsFairvaluemeasurementinputsDetails Fair Value Measurements - Fair value measurement inputs (Details) Details 72 false false R73.htm 0000073 - Disclosure - Fair Value Measurements - Changes in fair value of the promissory note (Details) Sheet http://transphormusa.com/role/FairValueMeasurementsChangesinfairvalueofthepromissorynoteDetails Fair Value Measurements - Changes in fair value of the promissory note (Details) Details 73 false false R74.htm 0000074 - Disclosure - Fair Value Measurements - Narrative (Details) Sheet http://transphormusa.com/role/FairValueMeasurementsNarrativeDetails Fair Value Measurements - Narrative (Details) Details 74 false false R75.htm 0000075 - Disclosure - Fair Value Measurements - Derivative instruments and hedging activities (Details) Sheet http://transphormusa.com/role/FairValueMeasurementsDerivativeinstrumentsandhedgingactivitiesDetails Fair Value Measurements - Derivative instruments and hedging activities (Details) Details 75 false false R76.htm 0000076 - Disclosure - 401(k) Savings Plan (Details) Sheet http://transphormusa.com/role/A401kSavingsPlanDetails 401(k) Savings Plan (Details) Details http://transphormusa.com/role/A401kSavingsPlan 76 false false R77.htm 0000077 - Disclosure - Income Taxes - Narrative (Details) Sheet http://transphormusa.com/role/IncomeTaxesNarrativeDetails Income Taxes - Narrative (Details) Details 77 false false R78.htm 0000078 - Disclosure - Income Taxes - Deferred tax assets and liabilities (Details) Sheet http://transphormusa.com/role/IncomeTaxesDeferredtaxassetsandliabilitiesDetails Income Taxes - Deferred tax assets and liabilities (Details) Details 78 false false R79.htm 0000079 - Disclosure - Income Taxes - Effective income tax rate reconciliation (Details) Sheet http://transphormusa.com/role/IncomeTaxesEffectiveincometaxratereconciliationDetails Income Taxes - Effective income tax rate reconciliation (Details) Details 79 false false R80.htm 0000080 - Disclosure - Related Party Transactions - Schedule of related party transactions (Details) Sheet http://transphormusa.com/role/RelatedPartyTransactionsScheduleofrelatedpartytransactionsDetails Related Party Transactions - Schedule of related party transactions (Details) Details 80 false false R81.htm 0000081 - Disclosure - Related Party Transactions- Schedule of total due to and from related parties (Details) Sheet http://transphormusa.com/role/RelatedPartyTransactionsScheduleoftotalduetoandfromrelatedpartiesDetails Related Party Transactions- Schedule of total due to and from related parties (Details) Details 81 false false R82.htm 0000082 - Disclosure - Subsequent Events (Details) Sheet http://transphormusa.com/role/SubsequentEventsDetails Subsequent Events (Details) Details http://transphormusa.com/role/SubsequentEvents 82 false false All Reports Book All Reports [dq-0542-Deprecated-Concept] Concept AccountsReceivableRelatedPartiesCurrent in us-gaap/2022 used in 2 facts was deprecated in us-gaap/2023 as of 2023 and should not be used. tgan-20230331.htm 4 [dq-0542-Deprecated-Concept] Concept AccountsPayableRelatedPartiesCurrent in us-gaap/2022 used in 2 facts was deprecated in us-gaap/2023 as of 2023 and should not be used. tgan-20230331.htm 4 [dq-0542-Deprecated-Concept] Concept RevenueFromRelatedParties in us-gaap/2022 used in 12 facts was deprecated in us-gaap/2023 as of 2023 and should not be used. tgan-20230331.htm 4 [dq-0542-Deprecated-Concept] Concept RelatedPartyTransactionDueFromToRelatedPartyCurrent in us-gaap/2022 used in 4 facts was deprecated in us-gaap/2023 as of 2023 and should not be used. tgan-20230331.htm 4 [dq-0542-Deprecated-Concept] Concept RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty in us-gaap/2022 used in 22 facts was deprecated in us-gaap/2023 as of 2023 and should not be used. tgan-20230331.htm 4 [dq-0542-Deprecated-Concept] Concept DueFromRelatedParties in us-gaap/2022 used in 6 facts was deprecated in us-gaap/2023 as of 2023 and should not be used. tgan-20230331.htm 4 [dq-0542-Deprecated-Concept] Concept DueToRelatedPartiesCurrentAndNoncurrent in us-gaap/2022 used in 6 facts was deprecated in us-gaap/2023 as of 2023 and should not be used. tgan-20230331.htm 4 [ix-0514-Hidden-Fact-Eligible-For-Transform] WARN: 5 fact(s) appearing in ix:hidden were eligible for transformation: us-gaap:FiniteLivedIntangibleAssetUsefulLife, us-gaap:LesseeOperatingLeaseRemainingLeaseTerm, us-gaap:LongTermDebtTerm, us-gaap:PropertyPlantAndEquipmentUsefulLife, us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1 - tgan-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:DeferredTaxAssetsNet has a value of -151000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:DeferredTaxAssetsNet fact are: Context: ib88f6c44096845b98c78cce89c613e49_I20230331, Unit: usd, Rule Element Id: 2701. tgan-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:DeferredTaxAssetsNet has a value of -60000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:DeferredTaxAssetsNet fact are: Context: ib13b677bbfd7477898a45d16764fa973_I20220331, Unit: usd, Rule Element Id: 2701. tgan-20230331.htm 4 tgan-20230331.htm exhibit42descriptionofregi.htm tgan-20230331.xsd tgan-20230331_cal.xml tgan-20230331_def.xml tgan-20230331_lab.xml tgan-20230331_pre.xml tganex23103312023consentof.htm tganex31103312023ceocertif.htm tganex31203312023cfocertif.htm tganex32103312023ceocfocer.htm tgan-20230331_g1.jpg http://fasb.org/us-gaap/2022 http://xbrl.sec.gov/dei/2022 true true