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Collaboration Agreements - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Apr. 30, 2020	Dec. 31, 2019
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Revenue recognized	$ 966,000	$ 1,528,000	$ 3,057,000	$ 3,740,000
Collaboration and License Agreement | Hanmi Pharmaceutical Co., LTD
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Upfront and near-term milestone payment	10,400,000		10,400,000				$ 10,000,000.0
Upfront fee	4,000,000.0		4,000,000.0				4,000,000.0
Milestone payment	6,000,000.0		6,000,000.0			$ 6,000,000.0
Milestone payment related to supply	400,000		400,000
Revenue recognized	1,000,000.0		3,100,000
Deferred revenue	$ 2,300,000		$ 2,300,000		$ 5,000,000.0
Collaboration and License Agreement | Hanmi Pharmaceutical Co., LTD | Maximum
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Contingent payments upon achievement of specified milestones							$ 108,000,000.0

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-Name Accounting Standards Codification
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