Stock-Based Compensation - Restricted Stock Units (Details) - Restricted stock units shares in Thousands	6 Months Ended
	Jun. 30, 2021 $ / shares shares
Shares
Balance (in shares) | shares	4,188
Granted (in shares) | shares	1,355
Vested (in shares) | shares	(1,387)
Canceled/Forfeited (in shares) | shares	(164)
Balance (in shares) | shares	3,992
Weighted Average Grant Date Fair Value
Balance (in dollars per share) | $ / shares	$ 34.02
Granted (in dollars per share) | $ / shares	103.67
Vested (in dollars per share) | $ / shares	26.50
Canceled/Forfeited (in dollars per share) | $ / shares	41.33
Balance (in dollars per share) | $ / shares	$ 59.73