Stock-Based Compensation - Cost by award type (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]
Stock-based compensation expensed and capitalized	$ 9,286	$ 2,368	$ 30,981	$ 5,399
Equity classified awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expensed and capitalized	9,970	1,052	24,620	3,258
Liability classified awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expensed and capitalized	$ (684)	$ 1,316	$ 6,361	$ 2,141