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Consolidated Statements of Stockholders' Equity (Deficit) - USD ($) $ in Thousands | Total | Common Stock Issued [Member] | In Treasury [Member] | Additional Paid-in Capital [Member] | Accumulated Deficit [Member] | Accumulated Other Comprehensive (loss) income [Member]
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2014 | $ 18,145 |  | $ (51) | $ 264,689 | $ (246,513) | $ 20
Balance (in shares) at Dec. 31, 2014 |  | 1,740 | (1) |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Compensation expense for issuance of stock options | 349 |  |  | 349 |  |
Compensation expense for issuance of restricted stock | 308 |  |  | 308 |  |
Compensation expense for issuance of restricted stock (in shares) |  | 103 |  |  |  |
Sale of common stock, net of expenses | 8,479 |  |  | 8,479 |  |
Sale of common stock, net of expenses (in shares) |  | 2,109 |  |  |  |
Exercise of warrants | 176 |  |  | 176 |  |
Exercise of warrants (in shares) |  | 39 |  |  |  |
Fair value of warrants issued classified as liability | (4,247) |  |  | (4,247) |  |
Fair value of warrants exercised | 123 |  |  | 123 |  |
Net loss | (14,704) |  |  |  | (14,704) |
Foreign currency translation | (28) |  |  |  |  | (28)
Balance at Dec. 31, 2015 | 8,601 |  | $ (51) | 269,877 | (261,217) | (8)
Balance (in shares) at Dec. 31, 2015 |  | 3,991 | (1) |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Compensation expense for issuance of stock options | 161 |  |  | 161 |  |
Compensation expense for issuance of restricted stock | 266 |  |  | 266 |  |
Compensation expense for issuance of restricted stock (in shares) |  | 7 |  |  |  |
Sale of common stock, net of expenses | 1,011 |  |  | 1,011 |  |
Sale of common stock, net of expenses (in shares) |  | 1,223 |  |  |  |
Issuance of common stock and rights for payments made in shares on convertible notes payable | 649 |  |  | 649 |  |
Issuance of common stock and rights for payments made in shares on convertible notes payable (in shares) |  | 5,158 |  |  |  |
Fair value of beneficial conversion feature of convertible note | 4,435 |  |  | 4,435 |  |
Exercise of warrants | 1,372 |  |  | 1,372 |  |
Exercise of warrants (in shares) |  | 1,426 |  |  |  |
Fair value of warrants issued classified as liability | (707) |  |  | (707) |  |
Fair value of warrants exercised | 726 |  |  | 726 |  |
Net loss | (17,971) |  |  |  | (17,971) |
Foreign currency translation | (33) |  |  |  |  | (33)
Balance at Dec. 31, 2016 | (1,490) |  | $ (51) | 277,790 | (279,188) | (41)
Balance (in shares) at Dec. 31, 2016 |  | 11,805 | (1) |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Compensation expense for issuance of stock options | 50 |  |  | 50 |  |
Compensation expense for issuance of restricted stock | 79 | $ 0 |  | 79 |  |
Compensation expense for issuance of restricted stock (in shares) |  | 261 |  |  |  |
Issuance of common stock and rights for payments made in shares on convertible notes payable | 40,121 | $ 1,137 |  | 38,984 |  |
Issuance of common stock and rights for payments made in shares on convertible notes payable (in shares) |  | 113,643,624 |  |  |  |
Fair value of beneficial conversion feature of convertible note | 4,908 |  |  | 4,908 |  |
Series B preferred stock dividend | (527) |  |  |  | (527) |
Exercise of warrants | 19 | $ 4 |  | 15 |  |
Exercise of warrants (in shares) |  | 367,950 |  |  |  |
Fair value of warrants exercised | 2,552 |  |  | 2,552 |  |
Adjustment for rounding related to Nov 2017 reverse stock split, (in shares) |  | 31,211 |  |  |  |
Net loss | (45,117) |  |  |  | (45,117) |
Foreign currency translation | 83 |  |  |  |  | 83
Balance at Dec. 31, 2017 | $ 678 | $ 1,141 | $ (51) | $ 324,378 | $ (324,832) | $ 42
Balance (in shares) at Dec. 31, 2017 |  | 114,054,851 | (1) |  |  |

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