License Agreements - Additional Information (Details) - USD ($)	2 Months Ended	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2020
George Washington
Research And Development Arrangement Contract To Perform For Others [Line Items]
Milestone payment			$ 500,000
Percentage of royalty on net sales				6.00%
Royalty payments		$ 300		$ 1,200
Harvard
Research And Development Arrangement Contract To Perform For Others [Line Items]
Clinical development and regulatory milestones amount payable				15,100,000
Royalties payment	$ 100,000
Payments related to clinical development and regulatory milestone payments	0
Paratek
Research And Development Arrangement Contract To Perform For Others [Line Items]
Royalties payment	33,000
Tetraphase and Everest Medicines Limited
Research And Development Arrangement Contract To Perform For Others [Line Items]
Future clinical development and regulatory milestone payments receivable	11,000,000.0	11,000,000.0		11,000,000.0
Sales milestone payments receivable	20,000,000.0	$ 20,000,000.0		$ 20,000,000.0
Royalties payable description				Royalties are payable with respect to each jurisdiction in the Territory until the latest to occur of: (1) the last-to-expire of specified patent rights in such jurisdiction in the Territory; (2) expiration of marketing or regulatory exclusivity in such jurisdiction in the Territory; or (3) 10 years after the first commercial sale of a product in such jurisdiction in the Territory.
Royalties payable period after first commercial sale of product				10 years
Payment received related to royalties or clinical development and regulatory milestones	$ 0