Summary of Significant Accounting Policies - Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Numerator
Numerator for basic earnings per share-net income	$ (8,627)	$ 11,989	$ 14,313
Numerator for diluted earnings per share-net income	$ (8,627)	$ 11,989	$ 14,313
Denominator
Basic weighted average common shares outstanding (in shares)	13,051,095	13,481,525	13,754,516
Dilutive effect of stock options (in shares)	0	289,868	384,217
Diluted weighted average common shares outstanding (in shares)	13,051,095	13,771,393	14,138,733
Basic net (loss) income per share
Basic (in dollars per share)	$ (0.66)	$ 0.89	$ 1.04
Diluted net (loss) income per share
Diluted (in dollars per share)	$ (0.66)	$ 0.87	$ 1.01