Income Taxes (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Tax Examination [Line Items]
Income tax expense	$ 514,000	$ 409,000	$ 1,415,000	$ 462,000
Effective income tax rate (as a percent)	10.00%	19.00%	13.00%	10.00%
Excess tax benefits from employee stock option exercises and vesting of restricted shares	$ 412,000	$ 11,000	$ 414,000	$ 367,000
Need for valuation allowance based on history of cumulative losses			3 years