Product Revenue and Reserves for Variable Consideration - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Total revenues	$ 90,142	$ 100,803	$ 178,620	$ 173,469
Product revenue, net
Disaggregation of Revenue [Line Items]
Total revenues	30,696	$ 29,089	59,905	$ 52,200
Accounts receivable, net	$ 20,300		$ 20,300		$ 23,000