Significant Agreements and Contracts -License Agreement with ACEA Therapeutics, Inc. - Additional Information (Details) - ACEA Therapeutics, Inc - License Agreement $ in Millions	1 Months Ended
Jul. 31, 2020 USD ($)
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Up-front licensee fee	$ 15.0
Minimum
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Percentage of upfront payment or milestone payment comprised of common stock	50.00%

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