Revenues, Recognition and Allowances - Adjustments to Gross Product Sales (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Reduction to gross product sales:
Revenue, net	$ 9,937	$ 14,339	$ 13,586	$ 7,447	$ 15,967	$ 18,466	$ 18,341	$ 13,122	$ 45,309	$ 65,896
Company product sales
Disaggregation of Revenue [Line Items]
Gross product sales									140,616	156,301
Reduction to gross product sales:
Chargebacks and billbacks									73,656	60,008
Wholesaler fees for service									5,745	9,000
Sales discounts and other allowances									17,611	23,002
Total reduction to gross product sales									97,012	92,010
Revenue, net									$ 43,604	$ 64,291