Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenue
Total revenue	$ 47,347	$ 44,759	$ 88,020	$ 80,068
Cost of revenue
Total cost of revenue	17,404	17,743	34,291	33,367
Gross profit	29,943	27,016	53,729	46,701
Operating expenses
Research and development	9,349	8,943	18,381	17,089
Sales and marketing	15,998	15,478	32,961	31,497
General and administrative	6,923	6,535	13,314	13,115
Total operating expenses	32,270	30,956	64,656	61,701
Loss from operations	(2,327)	(3,940)	(10,927)	(15,000)
Interest income	913	1,332	2,033	2,611
Interest expense	(2,308)	(2,170)	(4,582)	(4,291)
Other income (expense), net	210	(159)	(381)	(28)
Loss before income taxes	(3,512)	(4,937)	(13,857)	(16,708)
Benefit from (provision for) income taxes	44	80	(81)	116
Net loss	(3,468)	$ (4,857)	$ (13,938)	$ (16,592)
Weighted average shares used to compute net loss per share
Basic and Diluted		31,242	31,945	31,022
Product
Revenue
Total revenue	23,951	$ 23,132	$ 41,801	$ 37,135
Cost of revenue
Total cost of revenue	7,710	6,912	14,074	12,246
Service
Revenue
Total revenue	23,396	21,627	46,219	42,933
Cost of revenue
Total cost of revenue	$ 9,694	$ 10,831	$ 20,217	$ 21,121