Stock-Based Compensation - Summary of Total Stock-based Compensation Expense by Function (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share based compensation expense	$ 4,861	$ 11,374	$ 17,472	$ 24,747
Sales and Distribution Expenses
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share based compensation expense	748	2,421	1,761	5,218
Research and Development Expense
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share based compensation expense	778	1,920	3,231	3,952
General and Administrative Expense
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share based compensation expense	$ 3,335	$ 7,033	$ 12,480	$ 15,577