Stock-based Compensation - Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 33,520	$ 1,297	$ 49,887	$ 4,710
Cost of sales
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	1,619	83	2,829	237
Research and development
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	6,318	541	12,743	1,608
Sales and marketing
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	1,859	150	2,979	334
General and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 23,724	$ 523	$ 31,336	$ 2,531