Share-Based Compensation - Unvested RSAs Outstanding (Details) - RSAs	9 Months Ended
	Sep. 30, 2021 $ / shares shares
Number of Shares
Unvested RSAs, Beginning balance (in shares) | shares	357,883
Granted (in shares) | shares	147,406
Vested (in shares) | shares	(94,260)
Forfeited (in shares) | shares	(5,050)
Unvested RSAs, Ending balance (in shares) | shares	405,979
Weighted-Average Grant Date Fair Value
Unvested RSAs, Beginning balance (in dollars per share) | $ / shares	$ 36.30
Granted (in dollars per share) | $ / shares	42.37
Vested (in dollars per share) | $ / shares	48.31
Forfeited (in dollars per share) | $ / shares	36.56
Unvested RSAs, Ending balance (in dollars per share) | $ / shares	$ 35.69