Development, Commercialization and Supply Agreement - Changes in Balances of Contract Assets and Liabilities (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Contract liabilities:
Deferred revenue, Balance at Beginning of Period	$ 20,846	$ 20,710
Deferred revenue, Additions	3,750
Deferred revenue, Deductions	(2,789)	(547)
Deferred revenue, Balance at End of Period	$ 21,807	$ 20,163