Revenue Recognition - Schedule of Changes in Contract Assets and Liabilities (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2019 USD ($)
Contract assets:
Total contract assets, Balance at Beginning of Period	$ 9,880
Contract assets, Addition	3,461
Contract assets, Deduction	(9,553)
Total contract assets, Balance at End of Period	3,788
Contract liabilities:
Total contract liabilities, Balance at Beginning of Period	6,335
Contract liabilities, Addition	1,402
Contract liabilities, Deduction	(2,277)
Total contract liabilities, Balance at End of Period	5,460
Unbilled - collaboration and license revenue
Contract assets:
Total contract assets, Balance at Beginning of Period	9,880
Contract assets, Addition	3,461
Contract assets, Deduction	(9,553)
Total contract assets, Balance at End of Period	3,788
Deferred revenue
Contract liabilities:
Total contract liabilities, Balance at Beginning of Period	6,335
Contract liabilities, Addition	1,402
Contract liabilities, Deduction	(2,277)
Total contract liabilities, Balance at End of Period	$ 5,460