Revenues, Recognition and Allowances - Adjustments to Gross Product Sales (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Gross product sales	$ 36,717	$ 39,322	$ 59,883	$ 66,736
Deduction to gross product sales:
Chargebacks and billbacks	17,551	11,826	29,506	22,712
Wholesaler fees for service	1,604	2,182	2,746	3,948
Sales discounts and other allowances	4,537	7,446	7,467	9,713
Total reduction to gross product sales	23,692	21,454	39,719	36,373
Revenue, net	13,586	18,341	21,033	31,463
Company product sales
Deduction to gross product sales:
Revenue, net	$ 13,025	$ 17,868	$ 20,164	$ 30,363