Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenue:
Revenue	$ 19,588	$ 16,657	$ 34,377	$ 28,336
Cost of revenue:
Cost of goods and services sold	5,400	4,538	9,628	8,297
Gross profit	14,188	12,119	24,749	20,039
Operating expenses:
Research and development	2,089	1,849	4,413	4,215
Sales and marketing	7,485	7,072	13,764	14,223
General and administrative	5,491	5,657	10,699	11,217
Settlement expense	104	1,560	203	1,767
Total operating expenses	15,169	16,138	29,079	31,422
Operating loss from continuing operations	(981)	(4,019)	(4,330)	(11,383)
Other expense:
Interest income (expense), net	1,162	(734)	2,362	(1,338)
Foreign exchange gains (losses)	291	(151)	(593)	(254)
Other income (expense)	42	(195)	42	(247)
Income (loss) from continuing operations before income taxes	514	(5,099)	(2,519)	(13,222)
Income tax benefit (expense) from continuing operations	76	(634)	1,613	(697)
Income (loss) from continuing operations	590	(5,733)	(906)	(13,919)
Discontinued operations:
Loss from discontinued operations before income taxes		(738)		(2,878)
Income tax expense
Loss from discontinued operations		(738)		(2,878)
Net income (loss)	$ 590	$ (6,471)	$ (906)	$ (16,797)
Net income (loss) per ordinary share - basic
Income (loss) from continuing operations (in dollars per share)	$ 0.02	$ (0.22)	$ (0.03)	$ (0.54)
Loss from discontinued operations (in dollars per share)		(0.03)		(0.11)
Net income (loss) (in dollars per share)	0.02	(0.25)	(0.03)	(0.65)
Net income (loss) per ordinary share - diluted:
Income (loss) from continuing operations (in dollars per share)	0.02	(0.22)	(0.03)	(0.54)
Loss from discontinued operations (in dollars per share)		(0.03)		(0.11)
Net income (loss) (in dollars per share)	$ 0.02	$ (0.25)	$ (0.03)	$ (0.65)
Weighted-average shares used to compute net income (loss) per ordinary share - basic (in shares)	26,625,572	25,845,124	26,571,025	25,782,366
Weighted-average shares used to compute net income (loss) per ordinary share - diluted (in shares)	26,889,232	25,845,124	26,571,025	25,782,366
Product [Member]
Revenue:
Revenue	$ 18,666	$ 15,012	$ 32,507	$ 25,141
Cost of revenue:
Cost of goods and services sold	5,078	3,477	8,993	6,129
Service [Member]
Revenue:
Revenue	922	1,645	1,870	3,195
Cost of revenue:
Cost of goods and services sold	$ 322	$ 1,061	$ 635	$ 2,168