Stock-Based Compensation Expense and Employee Benefit Plans - Number of Shares Available for Grant (Details)	3 Months Ended
	Mar. 31, 2022 shares
Share-based Compensation Arrangement by Share-based Payment Award, Available for Grant [Roll Forward]
Beginning balance (in shares)	24,146,784
Added to plan (in shares)	8,384,460
Granted (in shares)	(3,972,652)
Cancelled (in shares)	261,572
Expired (in shares)	(161,292)
Ending Balance (in shares)	28,658,872