Net Income Per Share - Computation of Basic and Diluted Net Income Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Basic:
Net income	$ 4,377	$ 3,853
Diluted:
Net income	$ 4,377	$ 3,853
Denominator:
Weighted-average shares outstanding used in computing basic net income per share	18,015,424	17,735,671
Effect of potentially dilutive securities:
Stock awards	559,433	661,983
Weighted-average shares used in computing diluted net income per share	18,574,857	18,397,654
Net income per share:
Basic	$ 0.24	$ 0.22
Diluted	$ 0.24	$ 0.21