Share-Based Compensation - Summary of Stock Option Activity (Details) - Stock options shares in Thousands	3 Months Ended
	Mar. 31, 2021 $ / shares shares
Number of Shares Underlying Options
Outstanding, beginning balance (in shares) | shares	8,928
Granted (in shares) | shares	266
Exercised (in shares) | shares	(2)
Forfeited (in shares) | shares	(14)
Outstanding, ending balance (in shares) | shares	9,178
Vested and exercisable, end of period (in shares) | shares	4,856
Vested and expected to vest, end of period (in shares) | shares	8,832
Weighted Average Exercise Price
Outstanding, beginning balance (in dollars per share) | $ / shares	$ 9.22
Granted (in dollars per share) | $ / shares	6.38
Exercised (in dollars per share) | $ / shares	3.80
Forfeited (in dollars per share) | $ / shares	4.77
Outstanding, ending balance (in dollars per share) | $ / shares	9.41
Vested and exercisable, end of period (in dollars per share) | $ / shares	13.22
Vested and expected to vest, end of period (in dollars per share) | $ / shares	$ 9.58