CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Operating activities:
Net loss	$ (9,778)	$ (3,650)
Adjustments to reconcile net loss to net cash used for operating activities:
Depreciation and amortization	409	445
Stock compensation expense	502	488
Change in fair value of warrants	(107)	1,640
Inventory provision	(93)	(17)
Deferred rent expense	102	0
Foreign currency translation loss	1	10
Changes in operating assets and liabilities:
Inventory	(563)	(580)
Accounts receivable	4,966	1,250
Other current assets	146	(229)
Accounts payable	(300)	(1,976)
Accrued expenses	1,507	1,340
Other non-current assets and liabilities, net	(100)	(24)
Net cash used for operating activities	(3,122)	(1,269)
Investing activities:
Expenditures for property, plant and equipment	(70)	(13)
Other	0	93
Net cash (used in) provided by investing activities	(70)	80
Financing activities:
Net proceeds from issuance of common stock	71	258
Deferred financing costs	0	(97)
Payments on long-term debt	(10)	(9)
Net cash provided by financing activities	61	152
Net decrease in cash	(3,131)	(1,037)
Cash at beginning of period	22,978	14,581
Cash at end of period	19,847	13,544
Supplemental cash flow information (non-cash):
Additions to equipment in process included in accounts payable	102	706
Shares exchanged between common and preferred stock	38,389	0
Supplementary cash flows information:
Interest paid, net of interest capitalized	$ 221	$ 3