Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities
Net loss	$ (13,605)	$ (9,387)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	936	760
Share-based compensation expense	1,588	$ 1,025
Change in fair value of contingent purchase price consideration	$ 96
Loss on change in fair value of warrants		$ 22
Changes in operating assets and liabilities:
Accounts receivable, net	$ (800)	(204)
Inventory	964	(1,111)
Prepaid expenses and other assets	(878)	(455)
Accounts payable	51	1,198
Accrued liabilities	(1,217)	(2,405)
Deferred income	692	822
Net cash used in operating activities	(12,173)	(9,735)
Cash flows from investing activities
Purchases of property and equipment	(1,582)	(1,469)
Purchases of intangible assets	(44)	(17)
Decrease in restricted cash	200	57
Net cash used in investing activities	(1,426)	$ (1,429)
Cash flows from financing activities
Proceeds from issuance of ordinary shares	53,762
Proceeds from exercise of share options and warrants	10	$ 9
Payments on loan	(77)	(73)
Net cash provided by (used in) financing activities	53,695	(64)
Effect of exchange rate changes on cash and cash equivalents	109	509
Net increase (decrease) in cash and cash equivalents, excluding restricted cash	40,205	(10,719)
Cash and cash equivalents at beginning of period	50,165	76,494
Cash and cash equivalents at end of period	$ 90,370	65,775
Noncash investing and financing activities:
Warrants liability reclassified to additional paid-in capital upon exercise of warrants		$ 318