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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Cash flows from operating activities:    
Net loss $ (17,971) $ (14,704)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock option compensation expense 161 349
Restricted stock compensation expense 266 308
Depreciation expense 305 617
Loss on disposal of equipment 1 15
Warrant liability fair value adjustment (12,780) (564)
Non-cash interest income (1) (1)
Debt discount and deferred finance costs amortization 14,268 0
Changes in assets and liabilities:    
Decrease in prepaid expenses and other assets 260 9
Increase in accounts receivable (138) (52)
(Increase) decrease in inventories 95 (420)
Increase (decrease) in accounts payable and accrued expenses 1,507 (1,757)
Increase in deferred revenue 30 0
Decrease in other non-current liabilities (216) (220)
Net cash used in operating activities (14,213) (16,420)
Cash flows from investing activities:    
Purchase of property, plant and equipment (258) (170)
Increase in restricted cash (1,087) 0
Proceeds from sales of property, plant and equipment 0 180
Net cash provided by (used in) investing activities (1,345) 10
Cash flows from financing activities:    
Increase in restricted cash (26,200) 0
Net proceeds from convertible debt financing 31,226 0
Net proceeds from sale of stock and exercise of warrants 2,383 8,655
Net cash provided by financing activities 7,409 8,655
Foreign currency effects on cash and cash equivalents (49) (107)
Net decrease in cash and cash equivalents (8,198) (7,862)
Cash and cash equivalents:    
Beginning of period 12,607 20,469
End of period 4,409 12,607
Supplemental non-cash activities:    
Conversion of convertible notes 649 0
Fair value of warrants issued 28,472 4,247
Fair value of warrants exercised $ 726 $ 123