Collaborations (Tables)

12 Months Ended

Dec. 31, 2021

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Change in Accounts Receivable, Contract Asset and Liabilities

The following table presents the changes in accounts receivable, contract assets and liabilities for the year ended December 31, 2021 (in thousands)

	Balance at December 31, 2020		Additions		Deductions			Balance at December 31, 2021
Accounts receivable and contract assets:
Billed receivables – Sanofi	$	577	$	4,195	$	(4,772	)	$	—
Unbilled receivables – Sanofi		856		3,474		(4,195	)		135
Total accounts receivable and contract assets	$	1,433	$	7,669	$	(8,967	)	$	135
Contract Liabilities:
Deferred Revenue – Vertex	$	37,748	$	—	$	(18,536	)	$	19,212
Deferred Revenue – Sanofi		132,642		3,475		(54,295	)		81,822
Total contract liabilities	$	170,390	$	3,475	$	(72,831	)	$	101,034