Debt (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Jul. 31, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Jul. 31, 2018
Debt Instrument [Line Items]
Revolver		$ 10,000		$ 10,000		$ 15,000
Proceeds from Lines of Credit				13,500	$ 27,000
Repayments of Lines of Credit				18,500	12,000
BSBY | Minimum
Debt Instrument [Line Items]
Basis spread of interest rate	2.00%
BSBY | Maximum
Debt Instrument [Line Items]
Basis spread of interest rate	2.50%
Base rate | Minimum
Debt Instrument [Line Items]
Basis spread of interest rate	1.00%
Base rate | Maximum
Debt Instrument [Line Items]
Basis spread of interest rate	1.50%
Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Additional borrowing capacity	$ 10,000
Revised maximum borrowing capacity	45,000
Revolver		$ 10,000		$ 10,000
Effective interest rate		2.42%		2.42%
Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 35,000						$ 40,000
Line of credit facility, remaining borrowing capacity		$ 12,200		$ 12,200
Interest expense		$ 100	$ 100	$ 300	$ 400