0001213900-21-056770 | 10-Q | XBRL Viewer

Leases (Details) - Schedule of annual minimum lease payments of operating lease liabilities $ in Thousands	Sep. 30, 2021 USD ($)
Schedule of annual minimum lease payments of operating lease liabilities [Abstract]
2021 (excluding the nine months ended September 30, 2021)	$ 332
2022	1,327
2023	1,327
2024	1,327
2025	1,395
Thereafter	3,664
Total operating lease payments	9,372
Less: imputed interest	1,929
Present value of future minimum lease payments	$ 7,443

Stock-Based Compensation (Details) - Schedule of stock option activities	9 Months Ended
	Sep. 30, 2021
Stock-Based Compensation (Details) - Schedule of stock option activities [Line Items]
Weighted Average Remaining Contractual Term (years), Balance at ending	8 years 10 months 20 days
Weighted Average Remaining Contractual Term (years), Exercisable	8 years 1 month 17 days
Weighted Average Remaining Contractual Term (years), Granted
Weighted Average Remaining Contractual Term (years), Exercised
Weighted Average Remaining Contractual Term (years), Forfeited
Weighted Average Remaining Contractual Term (years),Expired

Accrued Expenses (Details) - Schedule of accrued expenses - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Schedule of accrued expenses [Abstract]
Payroll	$ 1,455	$ 1,530
Legal fees	26	156
Research and development costs	$ 142	$ 37

Net Loss Per Common Share (Details) - Schedule of weighted average dilutive common shares - shares	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Schedule of weighted average dilutive common shares [Abstract]
Stock options issued and outstanding	1,385,855	622,339
Restricted stock units issued and outstanding	383,119	407,325
Conversion of Series 1 Convertible Preferred Stock	8,029,039	8,029,039
Total potentially dilutive shares	9,798,013	9,058,703

Label	Element	Value
AmortizationOfDiscountsAndPremiumsInvestments	tara_AmortizationOfDiscountsAndPremiumsInvestments	$ 1,280,000
AmortizationOfDiscountsAndPremiumsInvestments	tara_AmortizationOfDiscountsAndPremiumsInvestments
UnrealizedGains	tara_UnrealizedGains
UnrealizedGains	tara_UnrealizedGains
UnrealizedGains	tara_UnrealizedGains
StockIssuedDuringPeriodValueIssuedForSettlementOfRestrictedStockUnits	tara_StockIssuedDuringPeriodValueIssuedForSettlementOfRestrictedStockUnits	(228,000)
StockIssuedDuringPeriodValueIssuedForSettlementOfRestrictedStockUnits	tara_StockIssuedDuringPeriodValueIssuedForSettlementOfRestrictedStockUnits	(228,000)
StockIssuedDuringPeriodValueIssuedForSettlementOfRestrictedStockUnits	tara_StockIssuedDuringPeriodValueIssuedForSettlementOfRestrictedStockUnits
StockIssuedDuringPeriodValueIssuedForSettlementOfRestrictedStockUnits	tara_StockIssuedDuringPeriodValueIssuedForSettlementOfRestrictedStockUnits
StockIssuedDuringPeriodValueIssuedForSettlementOfRestrictedStockUnits	tara_StockIssuedDuringPeriodValueIssuedForSettlementOfRestrictedStockUnits
StockIssuedDuringPeriodValueIssuedForSettlementOfRestrictedStockUnits	tara_StockIssuedDuringPeriodValueIssuedForSettlementOfRestrictedStockUnits
NetSettlement	tara_NetSettlement	34,706
StockIssuedDuringPeriodValueOfIssuanceOfSeries1ConvertiblePreferredInPublicOfferingNetOfOfferingCosts	tara_StockIssuedDuringPeriodValueOfIssuanceOfSeries1ConvertiblePreferredInPublicOfferingNetOfOfferingCosts	66,283,000
StockIssuedDuringPeriodValueOfIssuanceOfSeries1ConvertiblePreferredInPublicOfferingNetOfOfferingCosts	tara_StockIssuedDuringPeriodValueOfIssuanceOfSeries1ConvertiblePreferredInPublicOfferingNetOfOfferingCosts	66,283,000
StockIssuedDuringPeriodValueOfIssuanceOfSeries1ConvertiblePreferredInPublicOfferingNetOfOfferingCosts	tara_StockIssuedDuringPeriodValueOfIssuanceOfSeries1ConvertiblePreferredInPublicOfferingNetOfOfferingCosts
StockIssuedDuringPeriodValueOfIssuanceOfSeries1ConvertiblePreferredInPublicOfferingNetOfOfferingCosts	tara_StockIssuedDuringPeriodValueOfIssuanceOfSeries1ConvertiblePreferredInPublicOfferingNetOfOfferingCosts
StockIssuedDuringPeriodValueOfIssuanceOfSeries1ConvertiblePreferredInPublicOfferingNetOfOfferingCosts	tara_StockIssuedDuringPeriodValueOfIssuanceOfSeries1ConvertiblePreferredInPublicOfferingNetOfOfferingCosts
StockIssuedDuringPeriodValueOfIssuanceOfSeries1ConvertiblePreferredInPublicOfferingNetOfOfferingCosts	tara_StockIssuedDuringPeriodValueOfIssuanceOfSeries1ConvertiblePreferredInPublicOfferingNetOfOfferingCosts
ConnectionWithTheNetShareSettlement	tara_ConnectionWithTheNetShareSettlement	$ 228
StocksIssuedDuringPeriodValueNewIssues	tara_StocksIssuedDuringPeriodValueNewIssues	600,000
StocksIssuedDuringPeriodValueNewIssues	tara_StocksIssuedDuringPeriodValueNewIssues	121,750
StocksIssuedDuringPeriodValueNewIssues	tara_StocksIssuedDuringPeriodValueNewIssues	658,550
VestPeriod	tara_VestPeriod	10 years
ProceedsFromMaturityOfMarketableDebtSecuritiesAvailableforsale	tara_ProceedsFromMaturityOfMarketableDebtSecuritiesAvailableforsale	$ 2,600,000
ProceedsFromMaturityOfMarketableDebtSecuritiesAvailableforsale	tara_ProceedsFromMaturityOfMarketableDebtSecuritiesAvailableforsale
ProceedsFromRedemptionOfMarketableDebtSecuritiesAvailableforsale	tara_ProceedsFromRedemptionOfMarketableDebtSecuritiesAvailableforsale	13,828,000
ProceedsFromRedemptionOfMarketableDebtSecuritiesAvailableforsale	tara_ProceedsFromRedemptionOfMarketableDebtSecuritiesAvailableforsale
FairValueOfOptions	tara_FairValueOfOptions	1,059
StockIssuedDuringPeriodValueUnrealizedLossesOnAvailableforsaleDebtSecurities	tara_StockIssuedDuringPeriodValueUnrealizedLossesOnAvailableforsaleDebtSecurities	(164,000)
StockIssuedDuringPeriodValueUnrealizedLossesOnAvailableforsaleDebtSecurities	tara_StockIssuedDuringPeriodValueUnrealizedLossesOnAvailableforsaleDebtSecurities	(164,000)
StockIssuedDuringPeriodValueUnrealizedLossesOnAvailableforsaleDebtSecurities	tara_StockIssuedDuringPeriodValueUnrealizedLossesOnAvailableforsaleDebtSecurities	63,000
StockIssuedDuringPeriodValueUnrealizedLossesOnAvailableforsaleDebtSecurities	tara_StockIssuedDuringPeriodValueUnrealizedLossesOnAvailableforsaleDebtSecurities	63,000
StockIssuedDuringPeriodValueUnrealizedLossesOnAvailableforsaleDebtSecurities	tara_StockIssuedDuringPeriodValueUnrealizedLossesOnAvailableforsaleDebtSecurities	62,000
StockIssuedDuringPeriodValueUnrealizedLossesOnAvailableforsaleDebtSecurities	tara_StockIssuedDuringPeriodValueUnrealizedLossesOnAvailableforsaleDebtSecurities	62,000
StockIssuedDuringPeriodValueUnrealizedLossesOnAvailableforsaleDebtSecurities	tara_StockIssuedDuringPeriodValueUnrealizedLossesOnAvailableforsaleDebtSecurities
StockIssuedDuringPeriodValueUnrealizedLossesOnAvailableforsaleDebtSecurities	tara_StockIssuedDuringPeriodValueUnrealizedLossesOnAvailableforsaleDebtSecurities
StockIssuedDuringPeriodValueUnrealizedLossesOnAvailableforsaleDebtSecurities	tara_StockIssuedDuringPeriodValueUnrealizedLossesOnAvailableforsaleDebtSecurities
StockIssuedDuringPeriodValueUnrealizedLossesOnAvailableforsaleDebtSecurities	tara_StockIssuedDuringPeriodValueUnrealizedLossesOnAvailableforsaleDebtSecurities
StockIssuedDuringPeriodValueUnrealizedLossesOnAvailableforsaleDebtSecurities	tara_StockIssuedDuringPeriodValueUnrealizedLossesOnAvailableforsaleDebtSecurities
StockIssuedDuringPeriodValueUnrealizedLossesOnAvailableforsaleDebtSecurities	tara_StockIssuedDuringPeriodValueUnrealizedLossesOnAvailableforsaleDebtSecurities
StockIssuedDuringPeriodValueUnrealizedLossesOnAvailableforsaleDebtSecurities	tara_StockIssuedDuringPeriodValueUnrealizedLossesOnAvailableforsaleDebtSecurities
StockIssuedDuringPeriodValueUnrealizedLossesOnAvailableforsaleDebtSecurities	tara_StockIssuedDuringPeriodValueUnrealizedLossesOnAvailableforsaleDebtSecurities
StockIssuedDuringPeriodValueUnrealizedLossesOnAvailableforsaleDebtSecurities	tara_StockIssuedDuringPeriodValueUnrealizedLossesOnAvailableforsaleDebtSecurities
StockIssuedDuringPeriodValueUnrealizedLossesOnAvailableforsaleDebtSecurities	tara_StockIssuedDuringPeriodValueUnrealizedLossesOnAvailableforsaleDebtSecurities
StockIssuedDuringPeriodValueUnrealizedLossesOnAvailableforsaleDebtSecurities	tara_StockIssuedDuringPeriodValueUnrealizedLossesOnAvailableforsaleDebtSecurities
StockIssuedDuringPeriodValueUnrealizedLossesOnAvailableforsaleDebtSecurities	tara_StockIssuedDuringPeriodValueUnrealizedLossesOnAvailableforsaleDebtSecurities
ProceedsFromCommonStockInProteonPrivatePlacementNetOfOfferingCosts	tara_ProceedsFromCommonStockInProteonPrivatePlacementNetOfOfferingCosts	12,413,000
ProceedsFromCommonStockInProteonPrivatePlacementNetOfOfferingCosts	tara_ProceedsFromCommonStockInProteonPrivatePlacementNetOfOfferingCosts
DeferredOfferingCostsRecognizedPreviouslyRecordedInAccruedExpenses	tara_DeferredOfferingCostsRecognizedPreviouslyRecordedInAccruedExpenses	122,000
DeferredOfferingCostsRecognizedPreviouslyRecordedInAccruedExpenses	tara_DeferredOfferingCostsRecognizedPreviouslyRecordedInAccruedExpenses
PurchaseOfInsuranceAgreementWithNotesPayable	tara_PurchaseOfInsuranceAgreementWithNotesPayable	1,669,000
PurchaseOfInsuranceAgreementWithNotesPayable	tara_PurchaseOfInsuranceAgreementWithNotesPayable
ProceedsFromSeptemberCommonStockNetOfOfferingCosts	tara_ProceedsFromSeptemberCommonStockNetOfOfferingCosts	73,571,000
ProceedsFromSeptemberCommonStockNetOfOfferingCosts	tara_ProceedsFromSeptemberCommonStockNetOfOfferingCosts
CommonStockIssuedInConnectionWithTheReverseMerger	tara_CommonStockIssuedInConnectionWithTheReverseMerger	34,533,000
CommonStockIssuedInConnectionWithTheReverseMerger	tara_CommonStockIssuedInConnectionWithTheReverseMerger
StockIssuedDuringPeriodSharesIssuedForSettlementOfRestrictedStockUnits	tara_StockIssuedDuringPeriodSharesIssuedForSettlementOfRestrictedStockUnits	20,870
StockIssuedDuringPeriodSharesIssuedForSettlementOfRestrictedStockUnits	tara_StockIssuedDuringPeriodSharesIssuedForSettlementOfRestrictedStockUnits	16,766
StockIssuedDuringPeriodSharesIssuedForSettlementOfRestrictedStockUnits	tara_StockIssuedDuringPeriodSharesIssuedForSettlementOfRestrictedStockUnits	5,250
StockIssuedDuringPeriodSharesIssuedForSettlementOfRestrictedStockUnits	tara_StockIssuedDuringPeriodSharesIssuedForSettlementOfRestrictedStockUnits	1,875
StockIssuedDuringPeriodSharesIssuedForSettlementOfRestrictedStockUnits	tara_StockIssuedDuringPeriodSharesIssuedForSettlementOfRestrictedStockUnits
StockIssuedDuringPeriodSharesIssuedForSettlementOfRestrictedStockUnits	tara_StockIssuedDuringPeriodSharesIssuedForSettlementOfRestrictedStockUnits
StockIssuedDuringPeriodSharesIssuedForSettlementOfRestrictedStockUnits	tara_StockIssuedDuringPeriodSharesIssuedForSettlementOfRestrictedStockUnits
SharesAvailableForIssuance	tara_SharesAvailableForIssuance	353,734
SharesAvailableForIssuance	tara_SharesAvailableForIssuance	436,154
UnamortizedValueOfStock	tara_UnamortizedValueOfStock	$ 14,892
StockIssuedDuringPeriodValueOfIssuanceOfCommonStockInPublicOfferingNetOfOfferingCosts	tara_StockIssuedDuringPeriodValueOfIssuanceOfCommonStockInPublicOfferingNetOfOfferingCosts	5,000
StockIssuedDuringPeriodValueOfIssuanceOfCommonStockInPublicOfferingNetOfOfferingCosts	tara_StockIssuedDuringPeriodValueOfIssuanceOfCommonStockInPublicOfferingNetOfOfferingCosts	73,566,000
StockIssuedDuringPeriodValueOfIssuanceOfCommonStockInPublicOfferingNetOfOfferingCosts	tara_StockIssuedDuringPeriodValueOfIssuanceOfCommonStockInPublicOfferingNetOfOfferingCosts	73,571,000
StockIssuedDuringPeriodValueOfIssuanceOfCommonStockInPublicOfferingNetOfOfferingCosts	tara_StockIssuedDuringPeriodValueOfIssuanceOfCommonStockInPublicOfferingNetOfOfferingCosts
StockIssuedDuringPeriodValueOfIssuanceOfCommonStockInPublicOfferingNetOfOfferingCosts	tara_StockIssuedDuringPeriodValueOfIssuanceOfCommonStockInPublicOfferingNetOfOfferingCosts
StockIssuedDuringPeriodValueOfIssuanceOfCommonStockInPublicOfferingNetOfOfferingCosts	tara_StockIssuedDuringPeriodValueOfIssuanceOfCommonStockInPublicOfferingNetOfOfferingCosts
WeightedAverageRemainingAmortizationPeriod	tara_WeightedAverageRemainingAmortizationPeriod	2 years 3 months 7 days
WeightedAverageRemainingAmortizationPeriod	tara_WeightedAverageRemainingAmortizationPeriod	2 years 10 months 17 days
StockIssueDuringPeriodValueIssuanceOfSeries1ConvertiblePreferredStockInProteonPrivatePlacementNetOfOfferingCosts	tara_StockIssueDuringPeriodValueIssuanceOfSeries1ConvertiblePreferredStockInProteonPrivatePlacementNetOfOfferingCosts	$ 25,319,000
StockIssueDuringPeriodValueIssuanceOfSeries1ConvertiblePreferredStockInProteonPrivatePlacementNetOfOfferingCosts	tara_StockIssueDuringPeriodValueIssuanceOfSeries1ConvertiblePreferredStockInProteonPrivatePlacementNetOfOfferingCosts	25,319,000
StockIssueDuringPeriodValueIssuanceOfSeries1ConvertiblePreferredStockInProteonPrivatePlacementNetOfOfferingCosts	tara_StockIssueDuringPeriodValueIssuanceOfSeries1ConvertiblePreferredStockInProteonPrivatePlacementNetOfOfferingCosts
StockIssueDuringPeriodValueIssuanceOfSeries1ConvertiblePreferredStockInProteonPrivatePlacementNetOfOfferingCosts	tara_StockIssueDuringPeriodValueIssuanceOfSeries1ConvertiblePreferredStockInProteonPrivatePlacementNetOfOfferingCosts
StockIssueDuringPeriodValueIssuanceOfSeries1ConvertiblePreferredStockInProteonPrivatePlacementNetOfOfferingCosts	tara_StockIssueDuringPeriodValueIssuanceOfSeries1ConvertiblePreferredStockInProteonPrivatePlacementNetOfOfferingCosts
StockIssueDuringPeriodValueIssuanceOfSeries1ConvertiblePreferredStockInProteonPrivatePlacementNetOfOfferingCosts	tara_StockIssueDuringPeriodValueIssuanceOfSeries1ConvertiblePreferredStockInProteonPrivatePlacementNetOfOfferingCosts
UnrealizedLosses	tara_UnrealizedLosses	2,000
UnrealizedLosses	tara_UnrealizedLosses	37,000
UnrealizedLosses	tara_UnrealizedLosses	39,000
EstimatedFairValue	tara_EstimatedFairValue	53,016,000
EstimatedFairValue	tara_EstimatedFairValue	44,652,000
EstimatedFairValue	tara_EstimatedFairValue	$ 97,668,000
NumberSharesAuthorized	tara_NumberSharesAuthorized	25,037
NumberOfShareAuthorizedIncreased	tara_NumberOfShareAuthorizedIncreased	7,025
NumberOfShareAuthorizedIncreased	tara_NumberOfShareAuthorizedIncreased	25,037
StockIsuueDuringPeriodSharesIssuanceOfCommonStockInArTaraPrivatePlacementNetOfOfferingCosts	tara_StockIsuueDuringPeriodSharesIssuanceOfCommonStockInArTaraPrivatePlacementNetOfOfferingCosts	284,875
StockIsuueDuringPeriodSharesIssuanceOfCommonStockInArTaraPrivatePlacementNetOfOfferingCosts	tara_StockIsuueDuringPeriodSharesIssuanceOfCommonStockInArTaraPrivatePlacementNetOfOfferingCosts
StockIssueDuringPeriodValueIssuanceOfCommonStockInArTaraPrivatePlacementNetOfOfferingCosts	tara_StockIssueDuringPeriodValueIssuanceOfCommonStockInArTaraPrivatePlacementNetOfOfferingCosts	$ 1,867,000
StockIssueDuringPeriodValueIssuanceOfCommonStockInArTaraPrivatePlacementNetOfOfferingCosts	tara_StockIssueDuringPeriodValueIssuanceOfCommonStockInArTaraPrivatePlacementNetOfOfferingCosts	1,867,000
StockIssueDuringPeriodValueIssuanceOfCommonStockInArTaraPrivatePlacementNetOfOfferingCosts	tara_StockIssueDuringPeriodValueIssuanceOfCommonStockInArTaraPrivatePlacementNetOfOfferingCosts
StockIssueDuringPeriodValueIssuanceOfCommonStockInArTaraPrivatePlacementNetOfOfferingCosts	tara_StockIssueDuringPeriodValueIssuanceOfCommonStockInArTaraPrivatePlacementNetOfOfferingCosts
StockIssueDuringPeriodValueIssuanceOfCommonStockInArTaraPrivatePlacementNetOfOfferingCosts	tara_StockIssueDuringPeriodValueIssuanceOfCommonStockInArTaraPrivatePlacementNetOfOfferingCosts
StockIssueDuringPeriodValueIssuanceOfCommonStockInArTaraPrivatePlacementNetOfOfferingCosts	tara_StockIssueDuringPeriodValueIssuanceOfCommonStockInArTaraPrivatePlacementNetOfOfferingCosts
StockIssuedDuringPeriodSharesOfIssuanceOfSeries1ConvertiblePreferredInPublicOfferingNetOfOfferingCostsinShares	tara_StockIssuedDuringPeriodSharesOfIssuanceOfSeries1ConvertiblePreferredInPublicOfferingNetOfOfferingCostsinShares	4,148
StockIssuedDuringPeriodSharesOfIssuanceOfSeries1ConvertiblePreferredInPublicOfferingNetOfOfferingCostsinShares	tara_StockIssuedDuringPeriodSharesOfIssuanceOfSeries1ConvertiblePreferredInPublicOfferingNetOfOfferingCostsinShares
StockIssuedDuringPeriodSharesOfIssuanceOfCommonStockInPublicOfferingNetOfOfferingCostsinShares	tara_StockIssuedDuringPeriodSharesOfIssuanceOfCommonStockInPublicOfferingNetOfOfferingCostsinShares	4,600,000
StockIssuedDuringPeriodSharesOfIssuanceOfCommonStockInPublicOfferingNetOfOfferingCostsinShares	tara_StockIssuedDuringPeriodSharesOfIssuanceOfCommonStockInPublicOfferingNetOfOfferingCostsinShares
StcokIssueDuringPeriodSharesIssuanceOfSeries1ConvertiblePreferredStockInProteonPrivatePlacementNetOfOfferingCost	tara_StcokIssueDuringPeriodSharesIssuanceOfSeries1ConvertiblePreferredStockInProteonPrivatePlacementNetOfOfferingCost	3,879
StcokIssueDuringPeriodSharesIssuanceOfSeries1ConvertiblePreferredStockInProteonPrivatePlacementNetOfOfferingCost	tara_StcokIssueDuringPeriodSharesIssuanceOfSeries1ConvertiblePreferredStockInProteonPrivatePlacementNetOfOfferingCost
UnamortizedValueOfRsus	tara_UnamortizedValueOfRsus	$ 2,385
NumberOfSharesRestrictedStock	tara_NumberOfSharesRestrictedStock	269,689
NumberOfSharesRestrictedStock	tara_NumberOfSharesRestrictedStock	132,709