Stockholders' Equity - Restricted Stock Units (Details) - Restricted Stock Units	9 Months Ended
	Sep. 30, 2021 $ / shares shares
Number of shares
Outstanding at beginning of period (in shares) | shares	14,734
Granted (in shares) | shares	160,729
Vested (in shares) | shares	(5,987)
Forfeited (in shares) | shares	(1,281)
Non vested at end of period (in shares) | shares	168,195
Weighted-average grant date fair value
Outstanding at beginning of period (in dollars per share) | $ / shares	$ 95.86
Granted (in dollars per share) | $ / shares	75.75
Vested (in dollars per share) | $ / shares	91.35
Forfeited (in dollars per share) | $ / shares	96.90
Non vested outstanding at end of period (in dollars per share) | $ / shares	$ 76.80