Condensed Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders’ Equity (Unaudited) (Parentheticals) $ in Millions	3 Months Ended
Mar. 31, 2023 USD ($)
Statement of Stockholders' Equity [Abstract]
Issuance of common stock through underwritten offering, net of discounts and commissions and issuance costs	$ 6.6
Issuance of common stock through ATM offering, net of commissions and offering costs	$ 0.1

The amount of issuance of common stock through underwritten offering, net of discounts and commissions and issuance costs.

No definition available.

Name:	jspr_Issuanceofcommonstockthroughunderwrittenofferingnetofdiscountsandcommissionsandissuancecosts
Namespace Prefix:	jspr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration