Collaboration and Research Arrangements - Schedule of Change in Accounts Receivable, Contract Assets and Liabilities (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($)
Disaggregation Of Revenue [Line Items]
Accounts receivable and contract assets, Balance at Beginning of Period	$ 2,979
Accounts receivable and contract assets, Additions	6,038
Accounts receivable and contract assets, Deductions	(5,835)
Accounts receivable and contract assets, Balance at End of Period	3,182
Contract liabilities, Balance at Beginning of Period	10,181
Contract liabilities, Deduction	(2,408)
Contract liabilities, Balance at End of Period	7,773
Incyte
Disaggregation Of Revenue [Line Items]
Contract liabilities, Balance at Beginning of Period	1,268
Contract liabilities, Deduction	(421)
Contract liabilities, Balance at End of Period	847
Global Blood Therapeutics
Disaggregation Of Revenue [Line Items]
Contract liabilities, Balance at Beginning of Period	8,913
Contract liabilities, Deduction	(1,987)
Contract liabilities, Balance at End of Period	6,926
Billed receivables from collaboration partners
Disaggregation Of Revenue [Line Items]
Accounts receivable, Additions	2,857
Accounts receivable, Deduction	(2,857)
Unbilled receivables from collaboration partners
Disaggregation Of Revenue [Line Items]
Contract assets, Balance at Beginning of Period	2,979
Contract assets, Additions	3,181
Contract assets, Deduction	(2,978)
Contract assets, Balance at End of Period	$ 3,182