CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Operating activities:
Net loss	$ (12,166)	$ (6,694)
Adjustments to reconcile net loss to net cash used for operating activities:
Depreciation and amortization	784	923
Stock compensation expense	1,298	1,319
Change in fair value of warrants	(548)	(302)
Inventory provision	160	86
Deferred rent expense	51	260
Tenant improvement reimbursement	0	607
Foreign currency translation loss	13	11
Changes in operating assets and liabilities:
Inventory	173	(1,099)
Accounts receivable	2,364	1,888
Other current assets	48	(385)
Accounts payable	(404)	(2,305)
Accrued expenses	(388)	(711)
Other assets and liabilities, net	(161)	0
Net cash used for operating activities	(8,776)	(6,402)
Investing activities:
Expenditures for property, plant and equipment	(273)	(1,074)
Other	0	93
Net cash used in investing activities	(273)	(981)
Financing activities:
Net proceeds from issuance of common stock	132	352
Deferred financing costs	0	(96)
Borrowings under revolving credit agreement and term loan	0	2,400
Payments on long-term debt	(20)	(19)
Net cash provided by financing activities	112	2,637
Net decrease in cash	(8,937)	(4,746)
Cash at beginning of period	22,978	14,581
Cash at end of period	14,041	9,835
Supplemental cash flow information (non-cash):
Additions to equipment in process included in accounts payable	129	11
Shares exchanged between common and preferred stock	38,389	0
Supplementary cash flows information:
Interest paid, net of interest capitalized	$ 452	$ 0