License, Collaboration and Other Significant Agreements - Changes in Contract Assets and Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Contract liabilities:
Balance at End of Period	$ 75,796
Accounts receivable
Contract assets:
Balance at Beginning of Period	19,094	$ 3,045
Additions	19,542	6,740
Deductions	(14,320)	(6,246)
Balance at End of Period	24,316	3,539
Prepaid expenses and other current assets
Contract assets:
Balance at Beginning of Period	4,309	1,722
Additions	0	194
Deductions	(339)	0
Balance at End of Period	3,970	1,916
Deferred revenue
Contract liabilities:
Balance at Beginning of Period	42,380	40,559
Additions	60,514	22,895
Deductions	(27,098)	(25,902)
Balance at End of Period	75,796	37,552
Accounts payable
Contract liabilities:
Balance at Beginning of Period	3,171	7,227
Additions	0	0
Deductions	(2,852)	(7,227)
Balance at End of Period	319	0
Accrued expenses and other current liabilities
Contract liabilities:
Balance at Beginning of Period	0	10,000
Additions	0	0
Deductions	0	0
Balance at End of Period	$ 0	$ 10,000