Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenue
Product	$ 36,430	$ 30,207	$ 25,407
Service	49,648	32,575	24,098
Total revenue	86,078	62,782	49,505
Cost of revenue
Product	13,956	13,297	11,225
Service	25,516	16,247	12,784
Total cost of revenue	39,472	29,544	24,009
Gross profit	46,606	33,238	25,496
Operating expenses:
Research and development	13,881	10,381	6,961
Sales and marketing	34,964	30,402	25,487
General and administrative	23,181	16,010	14,837
Change in fair value of contingent purchase price consideration	(1,208)	202	72
Intangible assets impairment charges	1,765	419
Total operating expenses	72,583	57,414	47,357
Loss from operations	(25,977)	(24,176)	(21,861)
Other income (expense):
Interest expense, net	(864)	(67)	(52)
Foreign exchange gains (losses)	1,364	(143)	(352)
Other (expense) income	(646)	54	245
Loss before income taxes	(26,123)	(24,332)	(22,020)
Income tax benefit (expense)	3,774	(146)	(154)
Net loss	$ (22,349)	$ (24,478)	$ (22,174)
Net loss per ordinary share—basic and diluted (in dollars per share)	$ (1)	$ (1.12)	$ (1.28)
Weighted-average shares used to compute net loss per ordinary share—basic and diluted (in shares)	22,353,713	21,781,933	17,310,148