License Agreement - Additional Information (Details) - Zai License Agreement - USD ($) $ in Millions	1 Months Ended	3 Months Ended	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Dec. 31, 2019
License Agreement Transactions [Line Items]
Upfront cash payment receivable	$ 20.0	$ 20.0
Agreement continuation period	10 years
Upfront payment recognized revenue			$ 20.0
License
License Agreement Transactions [Line Items]
Revenues			$ 25.0
Development And Commercial Milestone | Maximum
License Agreement Transactions [Line Items]
License agreement milestone	$ 185.0
Development Milestone | INTRIGUE Study Related Milestone
License Agreement Transactions [Line Items]
License agreement milestone		5.0
Development Milestone | Maximum
License Agreement Transactions [Line Items]
License agreement milestone	50.0
Commercial Milestone | Maximum
License Agreement Transactions [Line Items]
License agreement milestone	$ 135.0
Development And Regulatory Milestone
License Agreement Transactions [Line Items]
License agreement milestone		$ 5.0