Share-Based Compensation - Unvested RSAs Outstanding (Details) - RSAs	9 Months Ended
	Sep. 30, 2020 $ / shares shares
Number of Shares
Unvested RSAs, Beginning Balance (in shares) | shares	351,048
Granted (in shares) | shares	135,292
Vested (in shares) | shares	(116,520)
Forfeited (in shares) | shares	(525)
Unvested RSAs, Ending Balance (in shares) | shares	369,295
Weighted-Average Grant Date Fair Value
Unvested RSAs, Beginning Balance (in dollars per share) | $ / shares	$ 40.67
Granted (in dollars per share) | $ / shares	26.89
Vested (in dollars per share) | $ / shares	40.46
Forfeited (in dollars per share) | $ / shares	40.44
Unvested RSAs, Ending Balance (in dollars per share) | $ / shares	$ 36.17