CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
Revenue	$ 71,594	$ 64,583	$ 199,971	$ 176,043
Cost of revenue	34,484	31,520	95,760	86,572
Gross margin	37,110	33,063	104,211	89,471
Operating expenses:
Research and development	11,144	10,347	32,595	30,246
Sales and marketing	13,520	12,692	38,608	36,082
General and administrative	6,913	5,109	19,534	16,413
Total operating expenses	31,577	28,148	90,737	82,741
Income from operations	5,533	4,915	13,474	6,730
Other income (expense), net:
Interest, net	327	125	819	224
Other income (expense), net	(82)	79	(864)	183
Total other income (expense), net	245	204	(45)	407
Income before income taxes	5,778	5,119	13,429	7,137
Income tax expense (benefit)	67	85	112	(2,459)
Net income	$ 5,711	$ 5,034	$ 13,317	$ 9,596
Net income per common share:
Basic (in dollars per share)	$ 0.22	$ 0.20	$ 0.51	$ 0.39
Diluted (in dollars per share)	$ 0.21	$ 0.19	$ 0.48	$ 0.36
Weighted-average number of shares:
Basic (in shares)	26,397	25,050	26,116	24,551
Diluted (in shares)	27,671	27,122	27,489	26,393