Share-Based Compensation - Summary of Stock Option Activity (Details) - Stock options shares in Thousands	9 Months Ended
	Sep. 30, 2021 $ / shares shares
Number of Shares Underlying Options
Outstanding, beginning balance (in shares) | shares	8,928
Granted (in shares) | shares	969
Exercised (in shares) | shares	(487)
Forfeited (in shares) | shares	(321)
Outstanding, ending balance (in shares) | shares	9,089
Vested and exercisable, end of period (in shares) | shares	5,154
Vested and expected to vest, end of period (in shares) | shares	8,768
Weighted Average Exercise Price
Outstanding, beginning balance (in dollars per share) | $ / shares	$ 9.22
Granted (in dollars per share) | $ / shares	7.84
Exercised (in dollars per share) | $ / shares	2.89
Forfeited (in dollars per share) | $ / shares	4.49
Outstanding, ending balance (in dollars per share) | $ / shares	9.85
Vested and exercisable, end of period (in dollars per share) | $ / shares	12.71
Vested and expected to vest, end of period (in dollars per share) | $ / shares	$ 9.99