Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash flows from operating activities
Net loss	$ (22,349,000)	$ (24,478,000)	$ (22,174,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization of intangible assets and loan fees	3,094,000	2,142,000	1,742,000
Change in fair value of contingent purchase price consideration	244,000	202,000	72,000
Write-off of contingent purchase price consideration	(1,452,000)
Intangible assets impairment charges	1,765,000	419,000
Share-based compensation expense	5,019,000	3,485,000	2,521,000
Loss on change in fair value of warrants			22,000
Loss on disposal of property and equipment		33,000
Changes in operating assets and liabilities:
Accounts receivable, net	(6,515,000)	(416,000)	(2,311,000)
Inventory, net	(741,000)	(893,000)	(1,214,000)
Prepaid expenses and other assets	(2,926,000)	(898,000)	(594,000)
Accounts payable	(1,145,000)	1,363,000	(109,000)
Accrued liabilities	4,753,000	2,742,000	696,000
Deferred income	(1,668,000)	(250,000)	572,000
Net cash used in operating activities	(21,921,000)	(16,549,000)	(20,777,000)
Cash flows from investing activities
Purchases of property and equipment	(2,383,000)	(3,425,000)	(3,014,000)
Purchases of intangible assets		(43,000)	(354,000)
Cash paid for acquisitions, net of cash acquired	(27,515,000)		(1,716,000)
Proceeds on sales of property and equipment		34,000
Change in restricted cash	(120,000)	312,000	57,000
Net cash used in investing activities	(30,018,000)	(3,122,000)	(5,027,000)
Cash flows from financing activities
Proceeds from issuance of ordinary shares		53,763,000
Proceeds from exercise of share options	76,000	20,000	14,000
Proceeds from term loan, net	29,457,000
Discount on the line of credit	(50,000)
Debt issuance costs	(289,000)
Payments on loan	(80,000)	(122,000)	(165,000)
Net cash provided by (used in) financing activities	29,114,000	53,661,000	(151,000)
Effect of exchange rate changes on cash and cash equivalents	(1,780,000)	(440,000)	(374,000)
Net (decrease) increase in cash and cash equivalents, excluding restricted cash	(24,605,000)	33,550,000	(26,329,000)
Cash and cash equivalents at beginning of year	83,715,000	50,165,000	76,494,000
Cash and cash equivalents at end of year	59,110,000	83,715,000	50,165,000
Supplemental disclosures
Cash paid for interest	450,000	41,000	50,000
Cash paid for taxes	141,000	50,000	115,000
Noncash investing and financing activities
Warrants liability reclassified to additional paid-in capital upon exercise of warrants			$ 318,000