Net Loss Per Share Attributable to Common Stockholders (Details)	Dec. 31, 2021 $ / shares
Earnings Per Share [Abstract]
Weighted-average number of shares of common stock outstanding	$ 0.282378

Weighted-average number of shares of common stock outstanding exchange ratio.

No definition available.

Name:	jspr_WeightedaverageNumberOfSharesOfCommonStockOutstandingExchangeRatio
Namespace Prefix:	jspr_
Data Type:	dtr:perShareItemType
Balance Type:	na
Period Type:	instant