Collaboration revenue (Tables)

3 Months Ended

Mar. 31, 2018

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Changes in Balances of Company's Celgene Receivables and Contract Liabilities

The following table presents changes in the balances of the Company’s Celgene receivables and contract liabilities during the three months ended March 31, 2018:

For the three months ended March 31, 2018 (in thousands)	Balance at beginning of period under Topic 606		Additions		Deductions			Balance at end of period under Topic 606
Receivables	$	4,635	$	1,641		—		$	6,276
Contract liabilities:
Deferred revenue	$	76,812		—		(13,966	)	$	62,846