Stock-Based Compensation - Restricted Stock Units (Details) - Restricted stock units shares in Thousands	9 Months Ended
	Sep. 30, 2020 $ / shares shares
Shares
Balance (in shares) | shares	2,404
Granted (in shares) | shares	2,571
Vested (in shares) | shares	(861)
Canceled/Forfeited (in shares) | shares	(213)
Balance (in shares) | shares	3,901
Weighted Average Grant Date Fair Value
Balance (in dollars per share) | $ / shares	$ 19.86
Granted (in dollars per share) | $ / shares	29.83
Vested (in dollars per share) | $ / shares	17.48
Canceled/Forfeited (in dollars per share) | $ / shares	24.11
Balance (in dollars per share) | $ / shares	$ 25.80