Equity-Based Compensation - Equity-Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total equity-based compensation expense	$ 2,222	$ 4,974	$ 8,101	$ 13,716
Income tax effect	0	0	0	0
After-tax effect of equity-based compensation expense	2,222	4,974	8,101	13,716
Cost of product sales
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total equity-based compensation expense	131	225	438	626
Research and development
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total equity-based compensation expense	237	691	260	2,051
Selling, general and administrative
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total equity-based compensation expense	$ 1,854	$ 4,058	$ 7,403	$ 11,039