Condensed Consolidated Statements of Income and Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Statement Of Income And Comprehensive Income [Abstract]
Revenue	$ 16,028	$ 14,556
Cost of revenue	6,831	6,835
Gross profit	9,197	7,721
Operating expenses
Research and development	1,890	1,258
Selling, general and administrative	2,478	1,946
Total operating expenses	4,368	3,204
Income from operations	4,829	4,517
Other income (expense), net	(30)	19
Income before income taxes	4,799	4,536
Provision for income taxes	422	683
Net income	$ 4,377	$ 3,853
Net income per share:
Basic	$ 0.24	$ 0.22
Diluted	$ 0.24	$ 0.21
Weighted average shares outstanding used in computing net income per share
Basic	18,015,424	17,735,671
Diluted	18,574,857	18,397,654
Comprehensive income:
Net income	$ 4,377	$ 3,853
Other comprehensive loss, net of tax:
Unrealized loss on available-for-sale debt securities, net of tax benefit of $13 and $5 for the three months ended March 31, 2022 and 2021, respectively	(50)	(20)
Comprehensive income	$ 4,327	$ 3,833