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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Cash flows from operating activities:    
Net loss $ (13,276,000) $ (8,480,000)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock option compensation expense 46,000 114,000
Restricted stock compensation expense 64,000 190,000
Depreciation expense 127,000 169,000
Loss on disposal of equipment 20,000 1,000
Warrant liability fair value adjustment (1,200,000) (491,000)
Gain on warrant extinguishment (9,613,000) 0
Non-cash interest income (1,000) (2,000)
Deferred revenue 2,000 19,000
Debt discount and deferred finance costs amortization 15,277,000 1,568,000
Changes in assets and liabilities:    
Decrease in prepaid expenses and other assets 201,000 170,000
Increase in accounts receivable (94,000) (94,000)
Decrease (increase) in inventories (208,000) 14,000
Increase (decrease) in accounts payable and accrued expenses 628,000 (42,000)
Decrease in other non-current liabilities (110,000) (104,000)
Net cash used in operating activities (8,137,000) (6,968,000)
Cash flows from investing activities:    
Purchase of property, plant and equipment (276,000) (95,000)
Increase in restricted cash 0 (1,062,000)
Net cash used in investing activities (276,000) (1,157,000)
Cash flows from financing activities:    
Increase in restricted cash 0 (29,200,000)
Net proceeds from the release of restricted cash 5,954,000 0
Net proceeds from convertible debt financing 0 31,523,000
Net proceeds from sale of stock and exercise of warrants 15,000 704,000
Net cash provided by financing activities 5,969,000 3,027,000
Foreign currency effects on cash and cash equivalents (149,000) (25,000)
Net decrease in cash and cash equivalents (2,593,000) (5,123,000)
Cash and cash equivalents:    
Beginning of period 4,409,000 4,409,000
End of period 1,816,000 1,818,000
Supplemental non-cash activities:    
Conversion of convertible notes 15,831,000 0
Fair value of warrants issued 0 28,133,000
Fair value of warrants exercised 19,000 245,000
Series C Warrants [Member]    
Cash flows from financing activities:    
Release of restricted cash for extinguishment of Series C Warrants 7,876,000 0
Extinguishment of Series C Warrants $ (7,876,000) $ 0