Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities
Net loss	$ (24,838)	$ (13,495)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization of intangible assets	1,993	1,205
Change in fair value of contingent purchase price consideration	(2,595)	112
Accretion and amortization of loan fees	289
Share-based compensation expense	2,760	2,459
Deferred income taxes	(2,471)
Changes in operating assets and liabilities:
Accounts receivable, net	(4,480)	(3,097)
Inventory, net	(1,775)	(2,054)
Prepaid expenses and other assets	(392)	877
Accounts payable	1,064	(1,009)
Accrued liabilities	2,872	(920)
Other liabilities, net	7,234
Deferred income		(1,506)
Net cash used in operating activities	(20,339)	(17,428)
Cash flows from investing activities
Purchases of property and equipment	(2,928)	(1,613)
Purchases of intangible assets	13
Net cash used in investing activities	(2,915)	(1,613)
Cash flows from financing activities
Proceeds from exercise of share options	308	12
Payments of tax withheld on vesting of restricted share units	(203)
Payments on loan	196	(39)
Net cash provided by (used in) financing activities	301	(27)
Effect of exchange rate changes on cash and cash equivalents	556	(682)
Net decrease in cash and cash equivalents, excluding restricted cash	(22,397)	(19,750)
Cash and cash equivalents at beginning of period	59,110	83,715
Cash and cash equivalents at end of period	$ 36,713	$ 63,965