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Collaboration Agreements - Changes in Balances of Receivables and Contract Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020
Contract Liabilities:
Beginning balance	$ 202,305
Ending balance	4,044,612
Remaining performance obligations	87,225
Collaboration Revenue by Strategic Collaborator
Contract Assets:
Beginning balance	1,972
Additions	120,821
Deductions	(117,249)
Ending balance	5,544
Contract Liabilities:
Beginning balance	199,528
Additions	121,882
Deductions	(81,228)
Ending balance	240,182
Amounts included in contract liabilities at the beginning of the period	72,863
Performance obligations satisfied (or partially satisfied) in previous reporting periods	8,366
Remaining performance obligations	$ 327,700

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (a)
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