Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net revenue:
Products	$ 33,486,000	$ 25,493,000	$ 89,688,000	$ 65,903,000
Service	4,687,000	4,788,000	14,173,000	14,278,000
Total net revenue	38,173,000	30,281,000	103,861,000	80,181,000
Cost of revenue:
Products	13,859,000	10,160,000	38,843,000	26,804,000
Service	2,104,000	2,378,000	6,241,000	7,155,000
Total cost of revenue	15,963,000	12,538,000	45,084,000	33,959,000
Gross profit	22,210,000	17,743,000	58,777,000	46,222,000
Operating expenses:
Sales and marketing	13,148,000	10,574,000	36,708,000	30,002,000
Research and development	3,467,000	2,914,000	9,393,000	8,335,000
General and administrative	3,379,000	2,716,000	10,143,000	9,933,000
Lease termination income	(4,000,000)		(4,000,000)
Total operating expenses	15,994,000	16,204,000	52,244,000	48,270,000
Income (loss) from operations	6,216,000	1,539,000	6,533,000	(2,048,000)
Interest and other income, net	197,000	166,000	746,000	527,000
Income (loss) before income taxes	6,413,000	1,705,000	7,279,000	(1,521,000)
Provision for income taxes	225,000	61,000	166,000	115,000
Net income (loss)	$ 6,188,000	$ 1,644,000	$ 7,113,000	$ (1,636,000)
Net income (loss) per share:
Basic (in dollars per share)	$ 0.44	$ 0.12	$ 0.51	$ (0.12)
Diluted (in dollars per share)	$ 0.42	$ 0.12	$ 0.48	$ (0.12)
Weighted-average number of shares used in per share calculations:
Basic (in shares)	13,973	13,163	13,917	13,102
Diluted (in shares)	14,767	13,544	14,733	13,102