Stockholders'/Members' Equity (Deficit) - Schedule of Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Class Of Stock [Line Items]
Stock-based compensation	$ 12,298	$ 0	$ 16,941	$ 0
Research and Development Expense
Class Of Stock [Line Items]
Stock-based compensation	1,154		2,109
General and Administrative Expense
Class Of Stock [Line Items]
Stock-based compensation	$ 11,144		$ 14,832