Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities
Net loss	$ (16,797)	$ (24,838)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization of intangible assets	2,243	1,993
Change in fair value of contingent purchase price consideration		(2,595)
Accretion and amortization of loan fees	280	289
Share-based compensation expense	2,746	2,760
Loss on disposal of property and equipment	83
Deferred income taxes	728	(2,471)
Changes in operating assets and liabilities:
Accounts receivable, net	(2,913)	(4,480)
Inventory, net	187	(1,775)
Prepaid expenses and other assets	(1,096)	(392)
Accounts payable	(3,292)	1,064
Accrued liabilities	(1,114)	2,872
Other liabilities, net	(44)	7,234
Net cash used in operating activities	(18,989)	(20,339)
Cash flows from investing activities
Purchases of property and equipment	(5,148)	(2,928)
Purchases of intangible assets		13
Net cash used in investing activities	(5,148)	(2,915)
Cash flows from financing activities
Proceeds from exercise of share options	814	308
Payments of tax withheld on vesting of restricted share units	(265)	(203)
Change in loans payable	(45)	196
Net cash provided by financing activities	504	301
Effect of exchange rate changes on cash and cash equivalents	(436)	556
Net decrease in cash, cash equivalents, and restricted cash	(24,069)	(22,397)
Cash, cash equivalents, and restricted cash at beginning of period	90,532	59,310
Cash, cash equivalents, and restricted cash at end of period	$ 66,463	$ 36,913