Revenue Recognition - Schedule of Changes in Contract Assets and Liabilities (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Capitalized Contract Cost [Line Items]
Total contract assets, Balance at Beginning of Period	$ 9,880
Contract assets, Addition	1,634
Contract assets, Deduction	(5,197)
Total contract assets, Balance at End of Period	6,317
Total contract liabilities, Balance at Beginning of Period	6,335
Contract liabilities, Addition	1,112
Contract liabilities, Deduction	(809)
Total contract liabilities, Balance at End of Period	6,638
Unbilled - collaboration and license revenue
Capitalized Contract Cost [Line Items]
Total contract assets, Balance at Beginning of Period	9,880
Contract assets, Addition	1,634
Contract assets, Deduction	(5,197)
Total contract assets, Balance at End of Period	6,317
Deferred revenue
Capitalized Contract Cost [Line Items]
Total contract liabilities, Balance at Beginning of Period	6,335
Contract liabilities, Addition	1,112
Contract liabilities, Deduction	(809)
Total contract liabilities, Balance at End of Period	$ 6,638