CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
Revenue	$ 69,228	$ 61,252	$ 128,377	$ 111,460
Cost of revenue	32,866	29,993	61,276	55,052
Gross margin	36,362	31,259	67,101	56,408
Operating expenses:
Research and development	10,511	10,055	21,451	19,899
Sales and marketing	12,553	11,943	25,088	23,390
General and administrative	6,328	5,587	12,621	11,304
Total operating expenses	29,392	27,585	59,160	54,593
Income from operations	6,970	3,674	7,941	1,815
Other income (expense), net:
Interest, net	256	61	492	99
Other income (expense), net	(425)	248	(782)	104
Total other income (expense), net	(169)	309	(290)	203
Income before income taxes	6,801	3,983	7,651	2,018
Income tax expense (benefit)	161	242	45	(2,544)
Net income	$ 6,640	$ 3,741	$ 7,606	$ 4,562
Net income per common share:
Basic (in dollars per share)	$ 0.25	$ 0.15	$ 0.29	$ 0.19
Diluted (in dollars per share)	$ 0.24	$ 0.14	$ 0.28	$ 0.18
Weighted-average number of shares:
Basic (in shares)	26,041	24,587	25,973	24,298
Diluted (in shares)	27,267	26,388	27,396	26,024