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Consolidated Statements of Stockholders' Deficit - USD ($) $ in Thousands | Total | Series D Preferred Stock [Member] | Series E Preferred Stock [Member] | Series E-1 Preferred Stock [Member] | Common Stock [Member] | Common Stock [Member] Series D Warrants [Member] | Preferred Stock [Member] | Preferred Stock [Member] Series D Preferred Stock [Member] | Preferred Stock [Member] Series E Preferred Stock [Member] | Preferred Stock [Member] Series E-1 Preferred Stock [Member] | Treasury Stock [Member] | Additional Paid in Capital [Member] | Additional Paid in Capital [Member] Series D Preferred Stock [Member] | Additional Paid in Capital [Member] Series E Preferred Stock [Member] | Additional Paid in Capital [Member] Series E-1 Preferred Stock [Member] | Accumulated Deficit [Member] | Accumulated Deficit [Member] Series E Preferred Stock [Member] | Accumulated Deficit [Member] Series E-1 Preferred Stock [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2017 | $ 678 |  |  |  |  |  |  |  |  |  | $ (51) | $ 325,519 |  |  |  | $ (324,832) |  |  | $ 42
Balance (in shares) at Dec. 31, 2017 |  |  |  |  | 377 |  |  |  |  |  | (1) |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation expense for issuance of restricted stock | 98 |  |  |  |  |  |  |  |  |  |  | 98 |  |  |  |  |  |  |
Compensation expense for issuance of restricted stock (in shares) |  |  |  |  | 236 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation income related to cancellation of stock options | (40) |  |  |  |  |  |  |  |  |  |  | (40) |  |  |  |  |  |  |
Sale of common stock, net of expenses | 10,916 |  |  |  |  |  |  |  |  |  |  | 10,916 |  |  |  |  |  |  |
Sale of common stock, net of expenses (in shares) |  |  |  |  | 7,624 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of pre-funded warrants | 520 |  |  |  |  |  |  |  |  |  |  | 520 |  |  |  |  |  |  |
Cashless exercise of warrants (in shares) |  |  |  |  | 49 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of warrants issued with Convertible Notes | 5,007 |  |  |  |  |  |  |  |  |  |  | 5,007 |  |  |  |  |  |  |
Fair value of warrants reclassified from liability to equity | 4,210 |  |  |  |  |  |  |  |  |  |  | 4,210 |  |  |  |  |  |  |
Beneficial conversion feature of convertible note | 44 |  |  |  |  |  |  |  |  |  |  | 44 |  |  |  |  |  |  |
Issuance of Preferred Stock |  | $ 1,004 |  |  |  |  |  |  |  |  |  |  | $ 1,004 |  |  |  |  |  |
Issuance of Preferred Stock (in shares) |  |  |  |  |  |  |  | 101 |  |  |  |  |  |  |  |  |  |  |
Fair value of warrants exchanged for Common Stock | 144 |  |  |  |  |  |  |  |  |  |  | 144 |  |  |  |  |  |  |
Retirement of Treasury Stock |  |  |  |  |  |  |  |  |  |  | $ 51 | (51) |  |  |  |  |  |  |
Retirement of Treasury Stock (in shares) |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |
Exercise of pre-funded warrants (in shares) |  |  |  |  | 5,250 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of warrants issued | (18,306) |  |  |  |  |  |  |  |  |  |  | (18,306) |  |  |  |  |  |  |
Foreign currency translation | 8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange of warrants for common stock (in shares) |  |  |  |  | 1,179 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) income | (19,222) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (19,222) |  |  |
Total comprehensive loss | 8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8
Balance at Dec. 31, 2018 | (14,939) |  |  |  |  |  |  |  |  |  |  | 329,065 |  |  |  | (344,054) |  |  | 50
Balance (in shares) at Dec. 31, 2018 |  |  |  |  | 14,715 |  | 101 |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation expense for issuance of stock options | 273 |  |  |  |  |  |  |  |  |  |  | 273 |  |  |  |  |  |  |
Compensation expense for issuance of restricted stock | 4 |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |
Compensation expense for issuance of restricted stock (in shares) |  |  |  |  | 20 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued due to fractional rounding upon reverse stock split |  |  |  |  | $ 1 |  |  |  |  |  |  | (1) |  |  |  |  |  |  |
Shares issued due to fractional rounding upon reverse stock split (in shares) |  |  |  |  | 27,524 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of Preferred Stock |  | $ 150 | $ 29,536 | $ 9,510 |  |  |  |  |  |  |  |  | $ 150 | $ 42,876 | $ 14,408 |  | $ (13,340) | $ (4,898) |
Issuance of Preferred Stock (in shares) |  |  |  |  |  |  |  | 15 | 32,572 | 9,510 |  |  |  |  |  |  |  |  |
Retirement of Series D Preferred Stock | (1,160) |  |  |  |  |  |  |  |  |  |  | (1,160) |  |  |  |  |  |  |
Retirement of Series D Preferred Stock (in Shares) |  |  |  |  |  |  | (116) |  |  |  |  |  |  |  |  |  |  |  |
Exercise of pre-funded warrants (in shares) |  |  |  |  |  | 11,285 |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of warrants issued | (20,844) |  |  |  |  |  |  |  |  |  |  | (20,844) |  |  |  |  |  |  |
Foreign currency translation | (22) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange of warrants for Common Stock | $ 13 |  |  |  |  |  |  |  |  |  |  | 13 |  |  |  |  |  |  |
Exchange of warrants for common stock (in shares) | 82,521 |  |  |  | 92 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Preferred stock into common stock | $ 1 |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |
Conversion of Preferred stock into common stock (in shares) |  |  |  |  | 13,455 |  | (565) |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) income | (8,879) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (8,879) |  |  |
Total comprehensive loss | (22) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (22)
Balance at Dec. 31, 2019 | $ (6,357) |  |  |  | $ 1 |  |  |  |  |  |  | $ 364,785 |  |  |  | $ (371,171) |  |  | $ 28
Balance (in shares) at Dec. 31, 2019 |  |  |  |  | 67,091 |  | 41,517 |  |  |  |  |  |  |  |  |  |  |  |

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