Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue:
Revenue	$ 59,753	$ 54,733	$ 46,988
Cost of revenue:
Cost of Goods and Services Sold, Total	16,826	18,470	16,491
Gross profit	42,927	36,263	30,497
Operating expenses:
Research and development	8,122	10,835	9,370
Sales and marketing	26,500	29,053	26,858
General and administrative	25,952	25,450	18,918
Change in fair value of contingent purchase price consideration		(3,475)	(1,208)
Intangible assets impairment charge	879	18,300	1,765
Settlement expense	2,193	10,028
Total operating expenses	63,646	90,191	55,703
Operating loss from continuing operations	(20,719)	(53,928)	(25,206)
Other income (expense):
Interest expense, net	(1,797)	(3,105)	(864)
Loss on extinguishment of debt	(2,105)
Foreign exchange gains (losses)	111	(1,850)	1,364
Other expense	(271)	(209)	(646)
Litigation settlement income		27,500
Loss from continuing operations before income taxes	(24,781)	(31,592)	(25,352)
Income tax benefit (expense) from continuing operations	37,286	(1,634)	3,774
Income (loss) from continuing operations	12,505	(33,226)	(21,578)
Discontinued operations:
Income (loss) from discontinued operations before income taxes	1,727	341	(771)
Gain on disposition	145,982
Income tax expense	(39,435)
Income (loss) from discontinued operations	108,274	341	(771)
Net loss	$ 120,779	$ (32,885)	$ (22,349)
Net income (loss) per ordinary share—basic:
Income (loss) from continuing operations, basic (in dollars per share)	$ 0.48	$ (1.40)	$ (0.97)
Income (loss) from discontinued operations, basic (in dollars per share)	4.17	0.01	(0.03)
Net income (loss), basic (in dollars per share)	4.65	(1.38)	(1)
Net income (loss) per ordinary share—diluted:
Income (loss) from continuing operations, diluted (in dollars per share)	0.47	(1.40)	(0.97)
Income (loss) from discontinued operations, diluted (in dollars per share)	4.10	0.01	(0.03)
Net income (loss), diluted (in dollars per share)	$ 4.58	$ (1.38)	$ (1)
Weighted-average shares used to compute net income (loss) per ordinary share—basic (in shares)	25,982,809	23,757,902	22,353,713
Weighted-average shares used to compute net income (loss) per ordinary share—diluted (in shares)	26,397,875	23,757,902	22,353,713
Product [Member]
Revenue:
Revenue	$ 54,687	$ 48,899	$ 43,070
Cost of revenue:
Cost of Goods and Services Sold, Total	13,668	13,864	13,807
Service [Member]
Revenue:
Revenue	5,066	5,834	3,918
Cost of revenue:
Cost of Goods and Services Sold, Total	$ 3,158	$ 4,606	$ 2,684