Apexian Sublicense Agreement - Additional Information (Details) - Apexian Sublicense Agreement - USD ($) $ in Millions		3 Months Ended
Jun. 04, 2020	Mar. 31, 2021
Sublicense Agreement [Abstract]
Stock issued (in shares)		891,422
Development and Regulatory Milestones \| Maximum
Sublicense Agreement [Abstract]
Milestone payments	$ 11
Sales Milestones \| Maximum
Sublicense Agreement [Abstract]
Milestone payments	$ 20

Number of new stock issued during the period.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
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+ Details