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Condensed Consolidated Statements of Stockholders' Equity Deficit - USD ($) $ in Thousands | Total | Common Stock Issued [Member] | Treasury Stock [Member] | Additional Paid-in Capital [Member] | Accumulated Deficit [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2014 | $ 18,145 |  | $ (51) | $ 264,689 | $ (246,513) | $ 20
Balance (in shares) at Dec. 31, 2014 |  | 5 | (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 |  |
Sale of common stock, net of expenses | 8,479 |  |  | 8,479 |  |
Sale of common stock, net of expenses (in shares) |  | 4 |  |  |  |
Exercise of warrants | 176 |  |  | 176 |  |
Fair value of warrants issued classified as liability | (4,247) |  |  | (4,247) |  |
Fair value of warrants exercised | 123 |  |  | 123 |  |
Net income (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 |  | 9 | (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 |  |
Sale of common stock, net of expenses | 1,011 |  |  | 1,011 |  |
Sale of common stock, net of expenses (in shares) |  | 2 |  |  |  |
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) |  | 10 |  |  |  |
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) |  | 3 |  |  |  |
Fair value of warrants issued classified as liability | (707) |  |  | (707) |  |
Fair value of warrants exercised | 726 |  |  | 726 |  |
Net income (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 |  | 24 | (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 |  |
Issuance of common stock and rights for payments made in shares on convertible notes payable | 40,121 | $ 2 |  | 40,119 |  |
Issuance of common stock and rights for payments made in shares on convertible notes payable (in shares) |  | 227,287 |  |  |  |
Fair value of beneficial conversion feature of convertible note | 4,908 |  |  | 4,908 |  |
Series B preferred stock dividend | (527) |  |  |  | (527) |
Exercise of warrants | 19 |  |  | 19 |  |
Exercise of warrants (in shares) |  | 736 |  |  |  |
Fair value of warrants exercised | 2,552 |  |  | 2,552 |  |
Adjustment for rounding related to Nov 2017 reverse stock split, (in shares) |  | 93 |  |  |  |
Net income (loss) | (45,117) |  |  |  | (45,117) |
Foreign currency translation | 83 |  |  |  |  | 83
Balance at Dec. 31, 2017 | 678 | $ 2 | $ (51) | 325,517 | (324,832) | 42
Balance (in shares) at Dec. 31, 2017 |  | 228,140 | (1) |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Compensation expense for issuance of stock options | 7 |  |  | 7 |  |
Compensation expense for issuance of restricted stock | 14 |  |  | 14 |  |
Sale of common stock, net of expenses | 4,252 | $ 7 |  | 4,245 |  |
Sale of common stock, net of expenses (in shares) |  | 668,855 |  |  |  |
Fair value of warrants issued | (18,306) |  |  | (18,306) |  |
Net income (loss) | 7,187 |  |  |  | 7,187 |
Foreign currency translation | (34) |  |  |  |  |
Total comprehensive loss | (34) |  |  |  |  | (34)
Balance at Mar. 31, 2018 | $ (6,202) | $ 9 | $ (51) | $ 311,477 | $ (317,645) | $ 8
Balance (in shares) at Mar. 31, 2018 |  | 896,995 | (1) |  |  |

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