Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue:
Revenue	$ 29,318	$ 26,120	$ 50,688	$ 47,625
Cost of revenue:
Cost of goods and services sold	12,706	12,492	23,296	22,989
Gross profit	16,612	13,628	27,392	24,636
Operating expenses:
Research and development	3,385	3,948	7,129	7,753
Sales and marketing	9,308	10,041	18,713	19,681
General and administrative	7,116	7,990	14,044	14,866
Change in fair value of contingent purchase price consideration		(238)		(2,595)
Settlement expense	1,560	9,635	1,767	9,635
Total operating expenses	21,369	31,376	41,653	49,340
Loss from operations	(4,757)	(17,748)	(14,261)	(24,704)
Other expense:
Interest expense, net	(733)	(807)	(1,337)	(1,630)
Foreign exchange losses	(151)	(547)	(254)	(653)
Other expense	(196)	(122)	(248)	(262)
Loss before income taxes	(5,837)	(19,224)	(16,100)	(27,249)
Income tax (expense) benefit	(634)	2,458	(697)	2,411
Net loss	$ (6,471)	$ (16,766)	$ (16,797)	$ (24,838)
Net loss per ordinary share—basic and diluted (in dollars per share)	$ (0.25)	$ (0.74)	$ (0.65)	$ (1.10)
Weighted-average shares used to compute net loss per ordinary share—basic and diluted (in shares)	25,845,124	22,805,379	25,782,366	22,670,206
Product [Member]
Revenue:
Revenue	$ 11,721	$ 10,422	$ 19,656	$ 18,808
Cost of revenue:
Cost of goods and services sold	3,477	4,094	6,051	7,339
Service [Member]
Revenue:
Revenue	17,597	15,698	31,032	28,817
Cost of revenue:
Cost of goods and services sold	$ 9,229	$ 8,398	$ 17,245	$ 15,650