0001213900-25-043743 | 10-Q | XBRL Viewer

Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value Recurring Basis (Details) $ in Thousands	Mar. 31, 2025 USD ($)
Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value Recurring Basis (Details) [Line Items]
Earnout liability

Leases - Schedule of Finance and Operating Leases (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Finance Leases:
Property plant and equipment, net	$ 1,227

Mezzanine and Stockholders’ Equity - Schedule of Total Number of Shares Outstanding and Authority to Issue (Details) shares in Thousands	Mar. 31, 2025 shares
Schedule of Total Number of Shares Outstanding and Authority to Issue [Abstract]
Total authorized	800,000

Merger Transaction - Schedule of Equity Instruments Outstanding (Details) shares in Thousands	Mar. 31, 2025 shares
Merger Transaction - Schedule of Equity Instruments Outstanding (Details) [Line Items]
Total Voting Shares, Shares	87,185

Merger Transaction - Schedule of Net Proceeds from the Merger (Details) $ in Thousands	Mar. 31, 2025 USD ($)
Merger Transaction - Schedule of Net Proceeds from the Merger (Details) [Line Items]
Total Cash in IPXX going into the Merger	$ 30,867
Transaction costs allocated to equity	(7,931)
Issuance costs for the PIPE investment	(400)
FPA Prepayments	(20,789)
Other Expenses and Prepayments	(1,658)
Total Cash used immediately after the merger	(30,778)
Transaction costs allocated to equity	350
Net cash used by USARE LLC	(350)
Total

Label	Element	Value
Triggering Events Occurred	usar_TriggeringEventsOccurred
Tax Exemption Period	usar_TaxExemptionPeriod	5 years
Forgivness Of Related Party Promissory Notein Shares	usar_ForgivnessOfRelatedPartyPromissoryNoteinShares	131,000
Gain On Fair Market Value Of Convertible Debt	usar_GainOnFairMarketValueOfConvertibleDebt	$ 60,300,000
Gain On Fair Market Value Of Convertible Debt	usar_GainOnFairMarketValueOfConvertibleDebt	1,000
Accretion Of Forward Purchase Agreements	usar_AccretionOfForwardPurchaseAgreements	69,000
Accretion Of Forward Purchase Agreements	usar_AccretionOfForwardPurchaseAgreements	(69,000)
Accretion Of Forward Purchase Agreements	usar_AccretionOfForwardPurchaseAgreements
Accretion Of Forward Purchase Agreements	usar_AccretionOfForwardPurchaseAgreements
Accretion Of Forward Purchase Agreements	usar_AccretionOfForwardPurchaseAgreements
Accretion Of Forward Purchase Agreements	usar_AccretionOfForwardPurchaseAgreements
Forgivness Of Related Party Promissory Note	usar_ForgivnessOfRelatedPartyPromissoryNote	1,527,000
Forgivness Of Related Party Promissory Note	usar_ForgivnessOfRelatedPartyPromissoryNote	1,250,000
Forgivness Of Related Party Promissory Note	usar_ForgivnessOfRelatedPartyPromissoryNote	2,777,000
Forgivness Of Related Party Promissory Note	usar_ForgivnessOfRelatedPartyPromissoryNote
Forgivness Of Related Party Promissory Note	usar_ForgivnessOfRelatedPartyPromissoryNote
Forgivness Of Related Party Promissory Note	usar_ForgivnessOfRelatedPartyPromissoryNote
Forgivness Of Related Party Promissory Note	usar_ForgivnessOfRelatedPartyPromissoryNote
Forgivness Of Related Party Promissory Note	usar_ForgivnessOfRelatedPartyPromissoryNote
Forgivness Of Related Party Promissory Note	usar_ForgivnessOfRelatedPartyPromissoryNote
Class A1 And A2 Convertible Preferred Stock Dividends	usar_ClassA1AndA2ConvertiblePreferredStockDividends	1,082,000
Class A1 And A2 Convertible Preferred Stock Dividends	usar_ClassA1AndA2ConvertiblePreferredStockDividends
Extinguishment Of Note Payable	usar_ExtinguishmentOfNotePayable	1,506,000
Extinguishment Of Note Payable	usar_ExtinguishmentOfNotePayable	1,506,000
Extinguishment Of Note Payable	usar_ExtinguishmentOfNotePayable
Extinguishment Of Note Payable	usar_ExtinguishmentOfNotePayable
Extinguishment Of Note Payable	usar_ExtinguishmentOfNotePayable
Extinguishment Of Note Payable	usar_ExtinguishmentOfNotePayable
Extinguishment Of Note Payable	usar_ExtinguishmentOfNotePayable
Extinguishment Of Note Payable	usar_ExtinguishmentOfNotePayable
Extinguishment Of Note Payable	usar_ExtinguishmentOfNotePayable
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Establishment Of Liabilities	usar_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationEstablishmentOfLiabilities	99,639,000
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Establishment Of Liabilities	usar_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationEstablishmentOfLiabilities	40,652,000
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Establishment Of Liabilities	usar_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationEstablishmentOfLiabilities	140,291,000
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Establishment Of Liabilities	usar_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationEstablishmentOfLiabilities
Undeclared Cumulative Dividends	usar_UndeclaredCumulativeDividends	(372,000)
Undeclared Cumulative Dividends	usar_UndeclaredCumulativeDividends
Finance Rightoutuse Assets Obtained In Exchange For Finance Lease Liabilities	usar_FinanceRightoutuseAssetsObtainedInExchangeForFinanceLeaseLiabilities	1,233,000
Finance Rightoutuse Assets Obtained In Exchange For Finance Lease Liabilities	usar_FinanceRightoutuseAssetsObtainedInExchangeForFinanceLeaseLiabilities
Proceeds From Issuance Of Series A2 Preferred And Warrants	usar_ProceedsFromIssuanceOfSeriesA2PreferredAndWarrants	(15,250,000)
Proceeds From Issuance Of Series A2 Preferred And Warrants	usar_ProceedsFromIssuanceOfSeriesA2PreferredAndWarrants
Dilution Of Noncontrolling Interest	usar_DilutionOfNoncontrollingInterest	12,000
Dilution Of Noncontrolling Interest	usar_DilutionOfNoncontrollingInterest	(12,000)
Dilution Of Noncontrolling Interest	usar_DilutionOfNoncontrollingInterest
Dilution Of Noncontrolling Interest	usar_DilutionOfNoncontrollingInterest
Dilution Of Noncontrolling Interest	usar_DilutionOfNoncontrollingInterest
Dilution Of Noncontrolling Interest	usar_DilutionOfNoncontrollingInterest
Dilution Of Noncontrolling Interest	usar_DilutionOfNoncontrollingInterest
Dilution Of Noncontrolling Interest	usar_DilutionOfNoncontrollingInterest
Dilution Of Noncontrolling Interest	usar_DilutionOfNoncontrollingInterest
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Issuance Of Warrants Additional Class APreferred	usar_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIssuanceOfWarrantsAdditionalClassAPreferred	2,279,000
Fair Value Of Earnout Shares	usar_FairValueOfEarnoutShares	$ 99,600,000
Fair Value Of Earnout Shares	usar_FairValueOfEarnoutShares	$ 46,200,000
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Conversion To Series APreferred Investor Warrant	usar_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsConversionToSeriesAPreferredInvestorWarrant	(5,279,000)
Proceeds From Early Termination Of Forward Purchase Agreements	usar_ProceedsFromEarlyTerminationOfForwardPurchaseAgreements	$ 3,322,000
Proceeds From Early Termination Of Forward Purchase Agreements	usar_ProceedsFromEarlyTerminationOfForwardPurchaseAgreements
Mineral Interests	usar_MineralInterests	17,125,000
Mineral Interests	usar_MineralInterests	$ 17,125,000
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Cashless Exercise To Common BUnits	usar_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsCashlessExerciseToCommonBUnits	(8,315,000)
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Cashless Exercise To Common BUnits	usar_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsCashlessExerciseToCommonBUnits	(1,968,000)
Issuance Of Common Stock In Reverse Recapitalization Mergerin Shares	usar_IssuanceOfCommonStockInReverseRecapitalizationMergerinShares	$ 2,000
Issuance Of Common Stock In Reverse Recapitalization Mergerin Shares	usar_IssuanceOfCommonStockInReverseRecapitalizationMergerinShares	27,718,000
Issuance Of Common Stock In Reverse Recapitalization Mergerin Shares	usar_IssuanceOfCommonStockInReverseRecapitalizationMergerinShares	(16,954,000)
Issuance Of Common Stock In Reverse Recapitalization Mergerin Shares	usar_IssuanceOfCommonStockInReverseRecapitalizationMergerinShares	10,766,000
Issuance Of Common Stock In Reverse Recapitalization Mergerin Shares	usar_IssuanceOfCommonStockInReverseRecapitalizationMergerinShares
Issuance Of Common Stock In Reverse Recapitalization Mergerin Shares	usar_IssuanceOfCommonStockInReverseRecapitalizationMergerinShares
Issuance Of Common Stock In Reverse Recapitalization Mergerin Shares	usar_IssuanceOfCommonStockInReverseRecapitalizationMergerinShares
Issuance Of Common Stock In Reverse Recapitalization Mergerin Shares	usar_IssuanceOfCommonStockInReverseRecapitalizationMergerinShares
Issuance Of Common Stock In Reverse Recapitalization Mergerin Shares	usar_IssuanceOfCommonStockInReverseRecapitalizationMergerinShares
Aggregate Purchase Price	usar_AggregatePurchasePrice	15,300,000
Non Cash Fair Value Gain On Financial Instruments	usar_NonCashFairValueGainOnFinancialInstruments	60,300,000
Establishment Of Earnoutliabilities	usar_EstablishmentOfEarnoutliabilities	(99,639,000)
Establishment Of Earnoutliabilities	usar_EstablishmentOfEarnoutliabilities	(99,639,000)
Establishment Of Earnoutliabilities	usar_EstablishmentOfEarnoutliabilities
Establishment Of Earnoutliabilities	usar_EstablishmentOfEarnoutliabilities
Establishment Of Earnoutliabilities	usar_EstablishmentOfEarnoutliabilities
Establishment Of Earnoutliabilities	usar_EstablishmentOfEarnoutliabilities
Establishment Of Earnoutliabilities	usar_EstablishmentOfEarnoutliabilities
Establishment Of Earnoutliabilities	usar_EstablishmentOfEarnoutliabilities
Establishment Of Earnoutliabilities	usar_EstablishmentOfEarnoutliabilities
Stock Issued During Period Shares Extinguishment Of Note Payable	usar_StockIssuedDuringPeriodSharesExtinguishmentOfNotePayable	140,000
Stock Issued During Period Shares Extinguishment Of Note Payable	usar_StockIssuedDuringPeriodSharesExtinguishmentOfNotePayable
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Dividends	usar_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsDividends	19,000
Class CAnd C1 Convertible Preferred Stock Dividends	usar_ClassCAndC1ConvertiblePreferredStockDividends	$ 1,960,000
Class CAnd C1 Convertible Preferred Stock Dividends	usar_ClassCAndC1ConvertiblePreferredStockDividends	1,792,000
Subscription Receivable	usar_SubscriptionReceivable	$ 1,250,000
Vesting Period	usar_VestingPeriod	1 year
Vesting Period	usar_VestingPeriod	3 years
Retroactive Application Of Recapitalization	usar_RetroactiveApplicationOfRecapitalization	$ 6,000
Retroactive Application Of Recapitalization	usar_RetroactiveApplicationOfRecapitalization	(3,704,000)
Retroactive Application Of Recapitalization	usar_RetroactiveApplicationOfRecapitalization	(3,189,000)
Retroactive Application Of Recapitalization	usar_RetroactiveApplicationOfRecapitalization	(73,079,000)
Retroactive Application Of Recapitalization	usar_RetroactiveApplicationOfRecapitalization	(13,404,000)
Retroactive Application Of Recapitalization	usar_RetroactiveApplicationOfRecapitalization	93,370,000
Retroactive Application Of Recapitalization	usar_RetroactiveApplicationOfRecapitalization
Retroactive Application Of Recapitalization	usar_RetroactiveApplicationOfRecapitalization
Retroactive Application Of Recapitalization	usar_RetroactiveApplicationOfRecapitalization
Fair Value Subscription Receivable Prepayment Amount	usar_FairValueSubscriptionReceivablePrepaymentAmount	20,800,000
Forward Purchase Agreements	usar_ForwardPurchaseAgreements	(351,000)
Forward Purchase Agreements	usar_ForwardPurchaseAgreements	(20,389,000)
Forward Purchase Agreements	usar_ForwardPurchaseAgreements	(20,740,000)
Forward Purchase Agreements	usar_ForwardPurchaseAgreements
Forward Purchase Agreements	usar_ForwardPurchaseAgreements
Forward Purchase Agreements	usar_ForwardPurchaseAgreements
Forward Purchase Agreements	usar_ForwardPurchaseAgreements
Forward Purchase Agreements	usar_ForwardPurchaseAgreements
Forward Purchase Agreements	usar_ForwardPurchaseAgreements
Stock Issued During Period Value Conversion Of Preferred Investor Warrants Into Liability Classified Warrants	usar_StockIssuedDuringPeriodValueConversionOfPreferredInvestorWarrantsIntoLiabilityClassifiedWarrants	(34,612,000)
Stock Issued During Period Value Conversion Of Preferred Investor Warrants Into Liability Classified Warrants	usar_StockIssuedDuringPeriodValueConversionOfPreferredInvestorWarrantsIntoLiabilityClassifiedWarrants	(34,612,000)
Stock Issued During Period Value Conversion Of Preferred Investor Warrants Into Liability Classified Warrants	usar_StockIssuedDuringPeriodValueConversionOfPreferredInvestorWarrantsIntoLiabilityClassifiedWarrants
Stock Issued During Period Value Conversion Of Preferred Investor Warrants Into Liability Classified Warrants	usar_StockIssuedDuringPeriodValueConversionOfPreferredInvestorWarrantsIntoLiabilityClassifiedWarrants
Stock Issued During Period Value Conversion Of Preferred Investor Warrants Into Liability Classified Warrants	usar_StockIssuedDuringPeriodValueConversionOfPreferredInvestorWarrantsIntoLiabilityClassifiedWarrants
Stock Issued During Period Value Conversion Of Preferred Investor Warrants Into Liability Classified Warrants	usar_StockIssuedDuringPeriodValueConversionOfPreferredInvestorWarrantsIntoLiabilityClassifiedWarrants
Stock Issued During Period Value Conversion Of Preferred Investor Warrants Into Liability Classified Warrants	usar_StockIssuedDuringPeriodValueConversionOfPreferredInvestorWarrantsIntoLiabilityClassifiedWarrants
Stock Issued During Period Value Conversion Of Preferred Investor Warrants Into Liability Classified Warrants	usar_StockIssuedDuringPeriodValueConversionOfPreferredInvestorWarrantsIntoLiabilityClassifiedWarrants
Stock Issued During Period Value Conversion Of Preferred Investor Warrants Into Liability Classified Warrants	usar_StockIssuedDuringPeriodValueConversionOfPreferredInvestorWarrantsIntoLiabilityClassifiedWarrants
Prepayment Of Forward Purchase Agreements	usar_PrepaymentOfForwardPurchaseAgreements	20,789,000
Prepayment Of Forward Purchase Agreements	usar_PrepaymentOfForwardPurchaseAgreements
Retroactive Application Of Recapitalizationin Shares	usar_RetroactiveApplicationOfRecapitalizationinShares	59,213,000
Retroactive Application Of Recapitalizationin Shares	usar_RetroactiveApplicationOfRecapitalizationinShares	(206,520,000)
Retroactive Application Of Recapitalizationin Shares	usar_RetroactiveApplicationOfRecapitalizationinShares	(20,779,000)
Retroactive Application Of Recapitalizationin Shares	usar_RetroactiveApplicationOfRecapitalizationinShares	(54,592,000)
Retroactive Application Of Recapitalizationin Shares	usar_RetroactiveApplicationOfRecapitalizationinShares	(7,861,000)
Early Terminations Of Forward Purchase Agreements	usar_EarlyTerminationsOfForwardPurchaseAgreements	$ 63,000
Early Terminations Of Forward Purchase Agreements	usar_EarlyTerminationsOfForwardPurchaseAgreements	3,271,000
Early Terminations Of Forward Purchase Agreements	usar_EarlyTerminationsOfForwardPurchaseAgreements	3,334,000
Early Terminations Of Forward Purchase Agreements	usar_EarlyTerminationsOfForwardPurchaseAgreements
Early Terminations Of Forward Purchase Agreements	usar_EarlyTerminationsOfForwardPurchaseAgreements
Early Terminations Of Forward Purchase Agreements	usar_EarlyTerminationsOfForwardPurchaseAgreements
Early Terminations Of Forward Purchase Agreements	usar_EarlyTerminationsOfForwardPurchaseAgreements
Early Terminations Of Forward Purchase Agreements	usar_EarlyTerminationsOfForwardPurchaseAgreements
Early Terminations Of Forward Purchase Agreements	usar_EarlyTerminationsOfForwardPurchaseAgreements
Earnout Liabilities	usar_EarnoutLiabilities	46,232,000
Earnout Liabilities	usar_EarnoutLiabilities
Mineral Interests At Cost	usar_MineralInterestsAtCost	17,125,000
Mineral Interests At Cost	usar_MineralInterestsAtCost	17,125,000
Deferred Grants	usar_DeferredGrants	8,200,000
Deferred Grants	usar_DeferredGrants	8,200,000
Equipment Deposits	usar_EquipmentDeposits	3,572,000
Equipment Deposits	usar_EquipmentDeposits	$ 3,060,000