Name:	jspr_CommonStockPrice
Namespace Prefix:	jspr_
Data Type:	dtr:perShareItemType
Balance Type:	na
Period Type:	duration

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

No definition available.

Name:	jspr_ExpectedVolatility
Namespace Prefix:	jspr_
Data Type:	dtr:percentItemType
Balance Type:	na
Period Type:	duration

The risk-free interest rate assumption that is used in valuing an option on its own shares.

No definition available.

Name:	jspr_RiskfreeInterestRate
Namespace Prefix:	jspr_
Data Type:	dtr:percentItemType
Balance Type:	na
Period Type:	duration

Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

No definition available.

Name:	jspr_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm
Namespace Prefix:	jspr_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

A valuation approach is the methodology used to determine the fair market value of a business.

No definition available.

Name:	jspr_ValuationMethodology
Namespace Prefix:	jspr_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 5
-SubTopic 10
-Topic 815
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480463/815-10-45-5

Name:	us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.