Collaboration and Research Arrangements (Tables)

12 Months Ended

Dec. 31, 2019

The following table presents the changes in contract assets and liabilities for the year ended December 31, 2019 (in thousands):

	Balance at December 31, 2018		Additions		Deductions		Balance at December 31, 2019
Contract assets:
Billed and unbilled receivables from collaboration partners	$	—	$	20,158	$	—	$	20,158
Contract liabilities:
Deferred revenue - Incyte	$	10,202	$	158	$	1,982	$	8,378
Deferred revenue - GBT		—		20,000		—		20,000
Total	$	10,202	$	20,158	$	1,982	$	28,378