Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statements of Operations:
Revenues	$ 82,040	$ 74,961	$ 162,207	$ 147,529
Cost of revenue	35,671	32,715	70,565	65,629
Gross profit	46,369	42,246	91,642	81,900
Operating expenses
Marketing and sales	14,630	11,453	27,617	22,395
Research and development	6,084	5,816	11,907	11,134
General and administrative	9,253	10,126	18,034	18,377
Total operating expenses	29,967	27,395	57,558	51,906
Income from operations	16,402	14,851	34,084	29,994
Other income, net	1,173	1,092	1,488	1,717
Income before income taxes	17,575	15,943	35,572	31,711
Provision for income taxes	5,489	5,252	11,286	10,358
Net income	$ 12,086	$ 10,691	$ 24,286	$ 21,353
Net income per share:
Basic (in dollars per share)	$ 0.46	$ 0.41	$ 0.91	$ 0.81
Diluted (in dollars per share)	$ 0.45	$ 0.40	$ 0.91	$ 0.80
Shares used to compute net income per share:
Basic - weighted-average shares outstanding: (in shares)	26,541,978	26,368,001	26,554,262	26,295,074
Diluted (in shares)	26,649,152	26,561,148	26,710,217	26,526,629
Comprehensive Income (net of tax)
Comprehensive income	$ 14,250	$ 8,547	$ 27,635	$ 19,953