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v3.23.1

Related Parties (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2023 | Dec. 31, 2022
Related Party Transactions [Abstract] |  |
Advisory and consulting services | $ 0.1 | $ 0.1

X
- Definition Amount of consulting services. + References No definition available. + Details
Name: | jspr_ConsultingServices
Namespace Prefix: | jspr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration