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Net Loss Per Share Attributable to Common Stockholders (Details) - Schedule of diluted net loss per share attributable to common stockholders - shares | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Schedule of Diluted Net Loss Per Share Attributable to Common Stockholders [Abstract] |  |
Outstanding and issued common stock options | 8,903,590 | 5,888,872
Common stock warrants | 4,999,863 | 4,999,863
Outstanding RSUs | 2,616,820 | 94,972
Unvested restricted common stock | 94,126 | 470,630
Total | 16,614,399 | 11,454,337

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- Definition Common stock warrants. + References No definition available. + Details
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Period Type: | duration

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- Definition Diluted net loss per share attributable to common stockholders. + References No definition available. + Details
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Namespace Prefix: | jspr_
Data Type: | xbrli:sharesItemType
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Period Type: | duration

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- Definition Number of restricted stock units outstanding. + References No definition available. + Details
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Namespace Prefix: | jspr_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Balance Type: | na
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- Definition Unvested restricted common stock. + References No definition available. + Details
Name: | jspr_UnvestedRestrictedCommonStock
Namespace Prefix: | jspr_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-1 + Details
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