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Condensed Consolidated Statements of Stockholders' Deficit (Unaudited) - USD ($) $ in Thousands | Total | Series D Preferred Stock [Member] | Common Stock Issued [Member] | Common Stock Issued [Member] Series D Warrants [Member] | Preferred Stock Issued [Member] | Preferred Stock Issued [Member] Series D Preferred Stock [Member] | Additional Paid in Capital [Member] | Additional Paid in Capital [Member] Series D Warrants [Member] | Additional Paid in Capital [Member] Series D Preferred Stock [Member] | Accumulated Deficit [Member] | Treasury Stock [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2017 | $ 678 |  | $ 2 |  |  |  | $ 325,517 |  |  | $ (324,832) | $ (51) | $ 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 (loss) income | 7,187 |  |  |  |  |  |  |  |  | 7,187 |  |
Total comprehensive loss | (34) |  |  |  |  |  |  |  |  |  |  | (34)
Balance at Mar. 31, 2018 | (6,202) |  | $ 9 |  |  |  | 311,477 |  |  | (317,645) | $ (51) | 8
Balance (in shares) at Mar. 31, 2018 |  |  | 896,995 |  |  |  |  |  |  |  | (1) |
Balance at Dec. 31, 2018 | (14,939) |  | $ 103 |  |  |  | 328,962 |  |  | (344,054) |  | 50
Balance (in shares) at Dec. 31, 2018 |  |  | 10,299,954 |  | 101 |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Compensation expense for issuance of stock options | 54 |  |  |  |  |  | 54 |  |  |  |  |
Compensation expense for issuance of restricted stock | 4 |  |  |  |  |  | 4 |  |  |  |  |
Compensation expense for issuance of restricted stock (in shares) |  |  | 15,000 |  |  |  |  |  |  |  |  |
Issuance of Series D Preferred Stock |  | $ 150 |  |  |  |  |  |  | $ 150 |  |  |
Issuance of Series D Preferred Stock (in shares) |  |  |  |  |  | 15 |  |  |  |  |  |
Retirement of Series D Preferred Stock |  | $ (1,160) |  |  |  |  |  |  | $ (1,160) |  |  |
Retirement of Series D Preferred Stock (in Shares) |  |  |  |  |  | (116) |  |  |  |  |  |
Exercise of Pre-Funded Series D Warrants |  |  |  | $ 41 |  |  |  | $ (41) |  |  |  |
Exercise of pre-funded Series D Warrants (in shares) |  |  |  | 4,119,500 |  |  |  |  |  |  |  |
Net (loss) income | (7,893) |  |  |  |  |  |  |  |  | (7,893) |  |
Total comprehensive loss | 7 |  |  |  |  |  |  |  |  |  |  | 7
Balance at Mar. 31, 2019 | $ (23,777) |  | $ 144 |  |  |  | $ 327,969 |  |  | $ (351,947) |  | $ 57
Balance (in shares) at Mar. 31, 2019 |  |  | 14,434,454 |  |  |  |  |  |  |  |  |

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