Stock-Based Compensation and Employee Benefit Plans - Number of Shares Available for Grant (Details)	3 Months Ended
	Mar. 31, 2020 shares
Options/ RSUs Available for Grant
Beginning balance (in shares)	17,233,144
Added to plan (in shares)	6,263,315
Granted (in shares)	(78,338)
Cancelled (in shares)	385,766
Expired (in shares)	(284,039)
Ending Balance (in shares)	23,519,848