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Collaboration and License Agreement - Additional Information (Details) - Bristol-Myers Squibb Company - USD ($)	1 Months Ended		3 Months Ended	6 Months Ended
	Jun. 30, 2020	May 31, 2020	Jun. 30, 2021	Jun. 30, 2021	Aug. 12, 2021	Jul. 31, 2021	Dec. 31, 2020
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Non-refundable upfront payment received			$ 50,000,000	$ 50,000,000
Collaboration and License Agreement
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Collaboration term expiration period		42 months
Initial nonrefundable upfront fee received	$ 50,000,000.0
Non-refundable upfront payment received		$ 50,000,000.0
Deferred revenue recognized			300,000	400,000
Deferred revenue			49,500,000	49,500,000			$ 49,900,000
Deferred revenue, current			8,800,000	8,800,000			2,100,000
Deferred revenue, noncurrent			$ 40,700,000	$ 40,700,000			$ 47,800,000
Collaboration and License Agreement | Subsequent Events | Reclassification Adjustment
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Deferred revenue, current					$ 6,200,000	$ 6,200,000
Deferred revenue, noncurrent					$ (6,200,000)	$ (6,200,000)
Collaboration and License Agreement | Maximum
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Milestone payments entitled to be received		301,000,000.0
Collaboration and License Agreement | Maximum | Research, Development and Regulatory Milestones
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Milestone payments entitled to be received		176,000,000.0
Collaboration and License Agreement | Maximum | Commercial Milestones
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Milestone payments entitled to be received		$ 125,000,000.0

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