Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statements of Operations:
Revenue	$ 117,455	$ 115,430	$ 346,839	$ 332,827
Cost of revenue	57,839	53,027	168,127	153,303
Gross profit	59,616	62,403	178,712	179,524
Operating expenses
Marketing and sales	17,604	16,818	55,466	50,947
Research and development	8,359	7,458	24,541	21,155
General and administrative	12,380	13,096	38,411	38,679
Total operating expenses	38,343	37,372	118,418	110,781
Income from operations	21,273	25,031	60,294	68,743
Other income, net	228	390	1,566	1,376
Income before income taxes	21,501	25,421	61,860	70,119
Provision for income taxes	4,709	4,484	13,391	12,817
Net income	$ 16,792	$ 20,937	$ 48,469	$ 57,302
Net income per share:
Basic (in dollars per share)	$ 0.63	$ 0.77	$ 1.80	$ 2.13
Diluted (in dollars per share)	$ 0.62	$ 0.77	$ 1.79	$ 2.10
Shares used to compute net income per share:
Basic (in shares)	26,846,030	27,038,585	26,894,420	26,963,205
Diluted (in shares)	27,005,341	27,337,886	27,072,873	27,268,311
Comprehensive Income (net of tax)
Comprehensive income	$ 14,642	$ 20,058	$ 46,317	$ 55,298