Revenues, Recognition and Allowances - Adjustments to Gross Product Sales (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Gross product sales	$ 44,264	$ 41,814	$ 104,147	$ 108,550
Deduction to gross product sales:
Chargebacks and billbacks	24,585	14,573	54,091	37,285
Wholesaler fees for service	1,445	2,355	4,191	6,303
Sales discounts and other allowances	4,302	6,658	11,769	16,371
Total reduction to gross product sales	30,332	23,586	70,051	59,959
Revenue, net	14,339	18,466	35,372	49,929
Company product sales
Deduction to gross product sales:
Revenue, net	$ 13,933	$ 18,228	$ 34,097	$ 48,591