Share-Based Compensation - Unvested RSAs Outstanding (Details) - RSAs	12 Months Ended
	Dec. 31, 2019 $ / shares shares
Number of Shares
Unvested RSAs, Beginning Balance (in shares) | shares	344,362
Granted (in shares) | shares	125,846
Forfeited (in shares) | shares	(2,588)
Vested (in shares) | shares	(116,572)
Unvested RSAs, Ending Balance (in shares) | shares	351,048
Weighted-Average Grant Date Fair Value
Unvested RSAs, Beginning Balance (in dollars per share) | $ / shares	$ 36.80
Granted (in dollars per share) | $ / shares	35.84
Forfeited (in dollars per share) | $ / shares	40.53
Vested (in dollars per share) | $ / shares	24.03
Unvested RSAs, Ending Balance (in dollars per share) | $ / shares	$ 40.67