Revenue from Contracts with Customers (Tables)

12 Months Ended

Dec. 31, 2019

Collaboration [Abstract]

Summary of Disaggregation of Revenue

The following table presents revenue (in thousands) for years ended December 31, 2019, 2018 and 2017, disaggregated by geographic region and revenue type. Revenue by geographic region is allocated based on the domicile of our respective business operations.

	Year ended December 31, 2019
	United States		Europe		Total
Revenue Type
Research and development services	$	1,707	$	—	$	1,707
License fees		75,500		—		75,500
Royalty sales milestone		15,100		—		15,100
Manufacturing services		3,337		—		3,337
Recognition of deferred research and development revenue		22,638		—		22,638
Recognition of deferred grant revenue		652		690		1,342
Non-cash royalties and milestones		30,424		—		30,424
	$	149,358	$	690	$	150,048
	Year ended December 31, 2018
Revenue Type
Research and development services	$	4,150	$	—	$	4,150
License and collaboration milestones		10,000		4,000		14,000
Recognition of deferred research and development revenue		1,325		—		1,325
Non-cash royalty revenue		17,309		—		17,309
	$	32,784	$	4,000	$	36,784
	Year ended December 31, 2017
Revenue Type
Research and development services	$	14,615	$	—	$	14,615
License and collaboration milestones		21,000		3,994		24,994
Recognition of deferred research and development revenue		3,100		—		3,100
Grant revenue		168		—		168
	$	38,883	$	3,994	$	42,877

Schedule of Information about Contract Assets and Contract Liabilities from Contracts with Customers

The following table provides information about contract assets and contract liabilities from contracts with customers (in thousands):

Year ended December 31, 2019	Balance at beginning of period		Additions		Deductions			Balance at end of period
Contract assets:
Unbilled receivables from collaboration partners	$	-	$	-	$	-		$	-
Contract liabilities:
Deferred revenue	$	2,052	$	77,000	$	(22,638	)	$	56,414