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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Cash flows from operating activities:    
Net loss $ (8,480) $ (7,189)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock option compensation expense 114 135
Restricted stock compensation expense 190 68
Depreciation expense 169 363
Loss on disposal of equipment 1 2
Warrant liability fair value adjustment (491) (161)
Non-cash interest income (2) (1)
Deferred revenue 19 0
Debt discount amortization 1,568 0
Changes in assets and liabilities:    
Decrease (increase) in prepaid expenses and other assets 170 (126)
Increase in accounts receivable (94) (285)
Decrease in inventories 14 59
Decrease in accounts payable and accrued expenses (42) (1,712)
Decrease in other non-current liabilities (104) (110)
Net cash used in operating activities (6,968) (8,957)
Cash flows from investing activities:    
Purchase of property, plant and equipment (95) (87)
Increase in restricted cash (1,062) 0
Proceeds from sales of property, plant and equipment 0 2
Net cash used in investing activities (1,157) (85)
Cash flows from financing activities:    
Increase in restricted cash (29,200) 0
Net proceeds from convertible debt financing 31,523 0
Net proceeds from sale of stock and exercise of warrants 704 2,656
Net cash provided by financing activities 3,027 2,656
Foreign currency effects on cash and cash equivalents (25) (30)
Net decrease in cash and cash equivalents (5,123) (6,416)
Cash and cash equivalents:    
Beginning of period 12,607 20,469
End of period 7,484 14,053
Supplemental non-cash activities:    
Fair value of warrants issued 28,132 820
Fair value of warrants exercised $ 245 $ 123