Consolidated Statements of Income and Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Consolidated Statements of Income and Comprehensive Income [Abstract]
Revenues	$ 81,189	$ 85,987	$ 76,070
Cost of revenues	48,154	51,770	46,952
Gross profit	33,035	34,217	29,118
Operating expenses:
Research and development	4,411	4,340	3,702
Selling, marketing and administrative	9,430	8,274	8,315
Total operating expenses	13,841	12,614	12,017
Income from operations	19,194	21,603	17,101
Interest and other income, net	623	769	708
Income before benefit (provision) for income taxes	19,817	22,372	17,809
Benefit (provision) for income taxes	(6,779)	(7,864)	999
Net income	13,038	14,508	18,808
Foreign currency translation adjustments	(1,275)	(961)	(392)
Net unrealized gain (loss) on investments available for sale	9	(15)	10
Comprehensive income	$ 11,772	$ 13,532	$ 18,426
Net income per share:
Basic	$ 0.74	$ 0.78	$ 1.06
Diluted	$ 0.73	$ 0.77	$ 1.02
Shares used in computing net income per share:
Basic	17,648	18,488	17,785
Diluted	17,945	18,935	18,481