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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash flows from operating activities:    
Net income (loss) $ 527 $ (13,276)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock option compensation (income) expense (40) 46
Restricted stock compensation (income) expense (81) 64
Depreciation expense 236 127
Loss on disposal of equipment 0 20
Warrant liability fair value adjustment (17,209) (1,200)
Gain on warrant extinguishment 0 (9,613)
Non-cash interest income (1) (1)
Deferred revenue 0 2
Loss on issuance of financial instrument 2,826 0
Debt discount amortization 238 15,277
Changes in assets and liabilities:    
Prepaid expenses and other assets 318 201
Accounts receivable (163) (94)
Inventories 43 (208)
Accounts payable and accrued expenses 3,985 628
Other non-current liabilities 44 (110)
Net cash used in operating activities (9,277) (8,137)
Cash flows from investing activities:    
Purchase of property, plant and equipment (39) (276)
Net cash used in investing activities (39) (276)
Cash flows from financing activities:    
Net proceeds from the release of restricted cash 263 5,954
Net proceeds from convertible note debt financing 2,172 0
Net proceeds from sale of stock 4,210 15
Net cash provided by financing activities 6,645 5,969
Foreign currency effects on cash and cash equivalents (45) (149)
Net decrease in cash and cash equivalents (2,716) (2,593)
Cash and cash equivalents:    
Beginning of period 3,999 4,409
End of period 1,283 1,816
Supplemental non-cash financing activities:    
Conversion of convertible notes 0 15,831
Fair value of warrants issued 23,532 0
Fair value of warrants exercised 0 19,000
Series C Warrants [Member]    
Cash flows from financing activities:    
Release of restricted cash for extinguishment of Series C Warrants 0 7,876
Extinguishment of Series C Warrants $ 0 $ (7,876)