Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Net revenue:
Revenue	$ 46,117,000	$ 40,573,000	$ 129,917,000	$ 117,251,000
Cost of revenue:
Cost of revenue	19,884,000	18,688,000	60,544,000	55,655,000
Gross profit	26,233,000	21,885,000	69,373,000	61,596,000
Operating expenses:
Sales and marketing	17,691,000	14,479,000	50,786,000	43,102,000
Research and development	3,643,000	3,244,000	10,622,000	10,895,000
General and administrative	7,308,000	5,160,000	18,100,000	15,501,000
Total operating expenses	28,642,000	22,883,000	79,508,000	69,498,000
Loss from operations	(2,409,000)	(998,000)	(10,135,000)	(7,902,000)
Interest and other expense, net	(146,000)	(49,000)	(180,000)	(80,000)
Loss before income taxes	(2,555,000)	(1,047,000)	(10,315,000)	(7,982,000)
Income tax expense (benefit)	73,000	(174,000)	(55,000)	(3,505,000)
Net loss	$ (2,628,000)	$ (873,000)	$ (10,260,000)	$ (4,477,000)
Net loss per share:
Basic (in dollars per share)	$ (0.19)	$ (0.06)	$ (0.73)	$ (0.33)
Diluted (in dollars per share)	$ (0.19)	$ (0.06)	$ (0.73)	$ (0.33)
Weighted-average number of shares used in per share calculations:
Basic (in shares)	14,182	13,851	14,095	13,717
Diluted (in shares)	14,182	13,851	14,095	13,717
Product [Member]
Net revenue:
Revenue	$ 40,315,000	$ 35,675,000	$ 113,045,000	$ 102,589,000
Cost of revenue:
Cost of revenue	16,343,000	15,909,000	50,278,000	46,876,000
Service [Member]
Net revenue:
Revenue	5,802,000	4,898,000	16,872,000	14,662,000
Cost of revenue:
Cost of revenue	$ 3,541,000	$ 2,779,000	$ 10,266,000	$ 8,779,000