Revenues, Recognition and Allowances - Adjustments to Gross Product Sales (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Deduction to gross product sales:
Revenue, net	$ 11,588	$ 7,447
Company product sales
Disaggregation of Revenue [Line Items]
Gross product sales	32,848	23,166
Deduction to gross product sales:
Chargebacks and billbacks	16,980	11,955
Wholesaler fees for service	1,359	1,142
Sales discounts and other allowances	3,914	2,930
Total reduction to gross product sales	22,253	16,027
Revenue, net	$ 10,595	$ 7,139