Stock Based Compensation - Restricted Stock Units Activity (Details) - Employees - Restricted Stock Units (RSUs)	9 Months Ended
	Sep. 30, 2021 $ / shares shares
Restricted Stock Units
Non-vested beginning balance (in shares) | shares	30,000
Granted (in shares) | shares	114,000
Forfeited (in shares) | shares	(2,500)
Non-vested ending balance (in shares) | shares	141,500
Weighted- Average Grant Date Fair Value
Beginning balance (in dollars per share) | $ / shares	$ 51.98
Granted (in dollars per share) | $ / shares	29.55
Forfeited (in dollars per share) | $ / shares	33.41
Ending balance (in dollars per share) | $ / shares	$ 34.24