Segments Operating Segments (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) Segments	Jun. 30, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | Segments			2
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
Product	16,241	16,220	27,727	24,889
Service	13,702	10,796	26,002	21,812
Total gross profit	29,943	27,016	53,729	46,701
Calculation of pretax profit (loss) [Abstract]
Operating expenses	32,270	30,956	64,656	61,701
Interest expense, net and other	(1,185)	(997)	(2,930)	(1,708)
Loss before income taxes	(3,512)	(4,937)	(13,857)	(16,708)
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