Share-Based Compensation - Summary of Stock Option Activity (Details) - Stock options shares in Thousands	6 Months Ended
	Jun. 30, 2021 $ / shares shares
Number of Shares Underlying Options
Outstanding, beginning balance (in shares) | shares	8,928
Granted (in shares) | shares	549
Exercised (in shares) | shares	(144)
Forfeited (in shares) | shares	(100)
Outstanding, ending balance (in shares) | shares	9,233
Vested and exercisable, end of period (in shares) | shares	5,148
Vested and expected to vest, end of period (in shares) | shares	8,903
Weighted Average Exercise Price
Outstanding, beginning balance (in dollars per share) | $ / shares	$ 9.22
Granted (in dollars per share) | $ / shares	6.66
Exercised (in dollars per share) | $ / shares	3.18
Forfeited (in dollars per share) | $ / shares	4.91
Outstanding, ending balance (in dollars per share) | $ / shares	9.47
Vested and exercisable, end of period (in dollars per share) | $ / shares	12.67
Vested and expected to vest, end of period (in dollars per share) | $ / shares	$ 9.62