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Collaboration Agreements - Additional Information (Details) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Apr. 30, 2020	Dec. 31, 2019
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Revenue recognized	$ 1,528,000	$ 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	10,000,000	10,000,000		$ 10,000,000
Upfront fee receivable	4,000,000	4,000,000		4,000,000
Milestone payment	6,000,000	6,000,000	$ 6,000,000
Revenue recognized	1,500,000	3,700,000
Deferred revenue	$ 6,300,000	$ 6,300,000		4,000,000
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

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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