Related Party Transactions - Additional Information (Details) $ in Thousands		3 Months Ended
	Jun. 11, 2018 USD ($) Investor	Mar. 31, 2022 USD ($)
Related Party Transaction [Line Items]
Net product sales		$ 152,522
Royalty Transfer Agreement
Related Party Transaction [Line Items]
Royalty owed to charitable foundation		$ 0
Royalty Transfer Agreement | Product
Related Party Transaction [Line Items]
Net product sales	$ 0
Royalty Transfer Agreement | MPM Oncology Charitable Foundation, Inc. and UBS Optimus Foundation
Related Party Transaction [Line Items]
Number of investors | Investor	2
Obligation to pay royalties		royalty equal to a total of 1% percent of its net product sales each year within 120 days following each year end.
Percentage of royalty required to pay	1.00%