CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Operating activities:
Net loss	$ (17,573)	$ (13,369)
Adjustments to reconcile net loss to net cash used for operating activities:
Depreciation and amortization	1,186	1,393
Stock compensation expense	2,053	1,973
Change in fair value of warrants	512	(99)
Inventory provision	232	98
Foreign currency translation loss	20	17
Changes in operating assets and liabilities:
Inventory	(793)	(2,325)
Accounts receivable	1,663	3,048
Other current assets	(202)	(278)
Accounts payable	(1,068)	(2,173)
Accrued expenses	(9)	(205)
Tenant improvement reimbursement	89	898
Deferred rent expense	2	438
Other assets and liabilities, net	(129)	0
Net cash used for operating activities	(14,017)	(10,584)
Investing activities:
Expenditures for property, plant and equipment	(792)	(1,314)
Net cash used in investing activities	(792)	(1,314)
Financing activities:
Net proceeds from issuance of common stock	7,549	469
Deferred financing costs	0	(244)
Borrowings under revolving credit agreement and term loan	0	8,400
Repayments of short-term debt	0	(2,400)
Payments on long-term debt	(252)	(28)
Net cash provided by financing activities	7,297	6,197
Net decrease in cash	(7,512)	(5,701)
Cash at beginning of period	22,978	14,581
Cash at end of period	15,466	8,880
Supplemental cash flow information (non-cash):
Additions to equipment in process included in accounts payable	486	36
Conversion of preferred stock into common stock	38,389	0
Warrants issued in connection with debt arrangement	0	190
Supplementary cash flows information:
Interest paid, net of interest capitalized	$ 691	$ 73