Stock-Based Compensation and Employee Benefit Plan - Number of Shares Available for Grant (Details)	3 Months Ended
	Mar. 31, 2021 shares
Options/ RSUs Available for Grant
Beginning balance (in shares)	20,233,754
Added to plan (in shares)	7,675,984
Granted (in shares)	(2,628,268)
Exercised (in shares)	0
Cancelled (in shares)	639,299
Expired (in shares)	(65,694)
Ending Balance (in shares)	25,855,075