Stock-Based Compensation - Restricted Stock Units (Details) - Restricted stock units shares in Thousands	3 Months Ended
	Mar. 31, 2021 $ / shares shares
Shares
Balance (in shares) | shares	4,188
Granted (in shares) | shares	1,180
Vested (in shares) | shares	(632)
Canceled/Forfeited (in shares) | shares	(78)
Balance (in shares) | shares	4,658
Weighted Average Grant Date Fair Value
Balance (in dollars per share) | $ / shares	$ 34.02
Granted (in dollars per share) | $ / shares	103.94
Vested (in dollars per share) | $ / shares	26.17
Canceled/Forfeited (in dollars per share) | $ / shares	35.35
Balance (in dollars per share) | $ / shares	$ 52.38