Revenue Recognition - Disaggregated Revenues by Timing of Transfer of Goods or Services (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Total revenues	$ 26,389	$ 22,169
Product revenue, net
Disaggregation of Revenue [Line Items]
Total revenues	25,637	20,362
Collaboration and license revenue
Disaggregation of Revenue [Line Items]
Total revenues	752	1,807
Transferred at a point in time
Disaggregation of Revenue [Line Items]
Total revenues	25,637	20,362
Transferred at a point in time | Product revenue, net
Disaggregation of Revenue [Line Items]
Total revenues	25,637	20,362
Transferred at a point in time | Collaboration and license revenue
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Transferred over time
Disaggregation of Revenue [Line Items]
Total revenues	752	1,807
Transferred over time | Product revenue, net
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Transferred over time | Collaboration and license revenue
Disaggregation of Revenue [Line Items]
Total revenues	$ 752	$ 1,807