Stock-Based Compensation - Summary of Restricted Stock Activity (Details) - Restricted Stock and Restricted Stock Units - $ / shares	3 Months Ended	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2021
Shares
Non-vested balance at beginning of period (in shares)	1,142,981	974,186
Granted (in shares)	2,458	347,788
Vested (in shares)	0	(135,662)
Canceled and forfeited (in shares)	(16,239)	(57,112)
Non-vested balance at end of period (in shares)	1,129,200	1,129,200
Weighted — Average Grant-Date Fair Value per Share
Non-vested balance at beginning of period (in dollars per share)	$ 34.23	$ 30.88
Granted (in dollars per share)	45.15	42.82
Vested (in dollars per share)	0	33.05
Canceled and forfeited (in dollars per share)	33.81	31.69
Non-vested balance at end of period (in dollars per share)	$ 34.26	$ 34.26