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Common Stock (Details) - Schedule of common stock reserved for future issuance - shares | Mar. 31, 2023 | Dec. 31, 2022
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Schedule Of Common Stock Reserved For Future Issuance Abstract |  |
Outstanding and issued common stock options | 8,903,590 | 6,169,180
Common stock warrants | 4,999,863 | 4,999,863
Outstanding restricted stock units | 2,616,820 | 2,617,445
Shares available for grant under 2021 Employee Stock Purchase Plan | 1,249,573 | 869,117
Shares available for grant under 2021 Equity Incentive Plan | 1,220,496 | 1,383,661
Shares available for grant under 2022 Inducement Equity Incentive Plan | 201,841 | 1,295,672
Total shares of common stock reserved | 19,192,183 | 17,334,938

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- Definition Common stock warrants. + References No definition available. + Details
Name: | jspr_CommonStockWarrant
Namespace Prefix: | jspr_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition Outstanding and issued common stock options. + References No definition available. + Details
Name: | jspr_OutstandingAndIssuedCommonStockOption
Namespace Prefix: | jspr_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
Name: | jspr_ScheduleOfCommonStockReservedForFutureIssuanceAbstract
Namespace Prefix: | jspr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Shares available for grant under 2019 Equity Incentive Plan. + References No definition available. + Details
Name: | jspr_SharesAvailableForGrantUnder2019EquityIncentivePlan
Namespace Prefix: | jspr_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition Shares available for grant under 2021 Employee Stock Purchase Plan. + References No definition available. + Details
Name: | jspr_SharesAvailableForGrantUnder2021EmployeeStockPurchasePlan
Namespace Prefix: | jspr_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition Shares available for grant under 2021 Equity Incentive Plan. + References No definition available. + Details
Name: | jspr_SharesAvailableForGrantUnder2021EquityIncentivePlan
Namespace Prefix: | jspr_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition Total shares of common stock reserved. + References No definition available. + Details
Name: | jspr_TotalSharesOfCommonStockReserved
Namespace Prefix: | jspr_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition Number of capital units or capital shares outstanding. This element is relevant to issuers of face-amount certificates and registered investment companies. + References No definition available. + Details
Name: | us-gaap_CapitalUnitsOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant