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Consolidated Statements of Stockholders' Equity (Deficit) - USD ($) $ in Thousands | Total | Series D Preferred Stock [Member] | Series E Preferred Stock [Member] | Series E-1 Preferred Stock [Member] | Common Stock [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] | Series D Warrants [Member] | Series D Warrants [Member] Common Stock [Member] | Series D Warrants [Member] Additional Paid in Capital [Member]
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Balance at Dec. 31, 2016 | $ (1,490) |  |  |  |  |  |  |  |  | $ (51) | $ 277,790 |  |  |  | $ (279,188) |  |  | $ (41) |  |  |
Balance (in shares) at Dec. 31, 2016 |  |  |  |  | 1 |  |  |  |  | (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 |  |  |  |  |  |  |  |  |  | 79 |  |  |  |  |  |  |  |  |  |
Issuance of common stock and rights for payments made in shares on convertible notes payable | 40,121 |  |  |  |  |  |  |  |  |  | 40,121 |  |  |  |  |  |  |  |  |  |
Issuance of common stock and rights for payments made in shares on convertible notes payable (in shares) |  |  |  |  | 375 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of beneficial conversion feature of convertible note | 4,908 |  |  |  |  |  |  |  |  |  | 4,908 |  |  |  |  |  |  |  |  |  |
Series B preferred stock dividend | (527) |  |  |  |  |  |  |  |  |  |  |  |  |  | (527) |  |  |  |  |  |
Warrants exercised | 19 |  |  |  |  |  |  |  |  |  | 19 |  |  |  |  |  |  |  |  |  |
Warrants exercised (in shares) |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of warrants exercised | 2,552 |  |  |  |  |  |  |  |  |  | 2,552 |  |  |  |  |  |  |  |  |  |
Net (loss) income | (45,117) |  |  |  |  |  |  |  |  |  |  |  |  |  | (45,117) |  |  |  |  |  |
Foreign currency translation | 83 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 83 |  |  |
Balance at Dec. 31, 2017 | 678 |  |  |  | $ 0 |  |  |  |  | $ (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 stock options | 7 |  |  |  |  |  |  |  |  |  | 7 |  |  |  |  |  |  |  |  |  |
Compensation expense for issuance of restricted stock | 14 |  |  |  |  |  |  |  |  |  | 14 |  |  |  |  |  |  |  |  |  |
Sale of common stock, net of expenses | 4,251 |  |  |  |  |  |  |  |  |  | 4,251 |  |  |  |  |  |  |  |  |  |
Sale of common stock, net of expenses (in shares) |  |  |  |  | 956 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of warrants issued | (18,306) |  |  |  |  |  |  |  |  |  | (18,306) |  |  |  |  |  |  |  |  |  |
Net (loss) income | 7,185 |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,185 |  |  |  |  |  |
Total comprehensive loss | (34) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (34) |  |  |
Balance at Mar. 31, 2018 | (6,205) |  |  |  | $ 0 |  |  |  |  | $ (51) | 311,485 |  |  |  | (317,647) |  |  | 8 |  |  |
Balance (in shares) at Mar. 31, 2018 |  |  |  |  | 1,333 |  |  |  |  | (1) |  |  |  |  |  |  |  |  |  |  |
Balance at Dec. 31, 2017 | 678 |  |  |  | $ 0 |  |  |  |  | $ (51) | 325,519 |  |  |  | (324,832) |  |  | 42 |  |  |
Balance (in shares) at Dec. 31, 2017 |  |  |  |  | 377 |  |  |  |  | (1) |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) income | (8,353) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation | 63 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at Sep. 30, 2018 | (4,865) |  |  |  | $ 0 |  |  |  |  | $ (51) | 328,266 |  |  |  | (333,185) |  |  | 105 |  |  |
Balance (in shares) at Sep. 30, 2018 |  |  |  |  | 8,138 |  |  |  |  | (1) |  |  |  |  |  |  |  |  |  |  |
Balance at Dec. 31, 2017 | 678 |  |  |  | $ 0 |  |  |  |  | $ (51) | 325,519 |  |  |  | (324,832) |  |  | 42 |  |  |
Balance (in shares) at Dec. 31, 2017 |  |  |  |  | 377 |  |  |  |  | (1) |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation income related to cancellation of stock options | (40) |  |  |  |  |  |  |  |  |  | (40) |  |  |  |  |  |  |  |  |  |
Compensation expense for issuance of restricted stock | 98 |  |  |  |  |  |  |  |  |  | 98 |  |  |  |  |  |  |  |  |  |
Compensation expense for issuance of restricted stock (in shares) |  |  |  |  | 236 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of common stock, net of expenses | 10,916 |  |  |  |  |  |  |  |  |  | 10,916 |  |  |  |  |  |  |  |  |  |
Sale of common stock, net of expenses (in shares) |  |  |  |  | 7,624 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of warrants issued | (18,306) |  |  |  |  |  |  |  |  |  | (18,306) |  |  |  |  |  |  |  |  |  |
Cashless exercise of warrants (in shares) |  |  |  |  | 49 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of pre-funded warrants | 520 |  |  |  |  |  |  |  |  |  | 520 |  |  |  |  |  |  |  |  |  |
Exercise of pre-funded Series D Warrants (in shares) |  |  |  |  | 5,250 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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) |  |  |  |  |  |  |  |  |  |
Fair value of beneficial conversion feature of convertible note | 44 |  |  |  |  |  |  |  |  |  | 44 |  |  |  |  |  |  |  |  |  |
Issuance of Preferred Stock |  | $ 1,004 |  |  |  |  |  |  |  |  |  | $ 1,004 |  |  |  |  |  |  |  |  |
Issuance of Preferred Stock (in shares) |  |  |  |  |  |  | 101 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange of warrants for common stock (in shares) |  |  |  |  | 1,179 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of warrants exchanged for common stock | 144 |  |  |  |  |  |  |  |  |  | 144 |  |  |  |  |  |  |  |  |  |
Retirement of Treasury Stock |  |  |  |  |  |  |  |  |  | $ 51 | (51) |  |  |  |  |  |  |  |  |  |
Retirement of Treasury Stock (in shares) |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |
Net (loss) income | (19,222) |  |  |  |  |  |  |  |  |  |  |  |  |  | (19,222) |  |  |  |  |  |
Foreign currency translation | 8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8 |  |  |
Balance at Dec. 31, 2018 | (14,939) |  |  |  | $ 0 |  |  |  |  | $ 0 | 329,065 |  |  |  | (344,054) |  |  | 50 |  |  |
Balance (in shares) at Dec. 31, 2018 |  |  |  |  | 14,715 | 101 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at Mar. 31, 2018 | (6,205) |  |  |  | $ 0 |  |  |  |  | $ (51) | 311,485 |  |  |  | (317,647) |  |  | 8 |  |  |
Balance (in shares) at Mar. 31, 2018 |  |  |  |  | 1,333 |  |  |  |  | (1) |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation expense for issuance of stock options | (47) |  |  |  |  |  |  |  |  |  | (47) |  |  |  |  |  |  |  |  |  |
Compensation expense for issuance of restricted stock | (95) |  |  |  |  |  |  |  |  |  | (95) |  |  |  |  |  |  |  |  |  |
Sale of common stock, net of expenses | (41) |  |  |  |  |  |  |  |  |  | (41) |  |  |  |  |  |  |  |  |  |
Net (loss) income | (6,658) |  |  |  |  |  |  |  |  |  |  |  |  |  | (6,658) |  |  |  |  |  |
Total comprehensive loss | (44) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (44) |  |  |
Balance at Jun. 30, 2018 | (13,090) |  |  |  | $ 0 |  |  |  |  | $ (51) | 311,302 |  |  |  | (324,305) |  |  | (36) |  |  |
Balance (in shares) at Jun. 30, 2018 |  |  |  |  | 1,333 |  |  |  |  | (1) |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation expense for issuance of restricted stock | 116 |  |  |  |  |  |  |  |  |  | 116 |  |  |  |  |  |  |  |  |  |
Compensation expense for issuance of restricted stock (in shares) |  |  |  |  | 86 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of common stock, net of expenses | 7,067 |  |  |  |  |  |  |  |  |  | 7,067 |  |  |  |  |  |  |  |  |  |
Sale of common stock, net of expenses (in shares) |  |  |  |  | 6,669 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cashless exercise of warrants (in shares) |  |  |  |  | 50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of pre-funded warrants | 520 |  |  |  |  |  |  |  |  |  | 520 |  |  |  |  |  |  |  |  |  |
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) |  |  |  |  |  |  |  |  |  |
Fair value of beneficial conversion feature of convertible note | 44 |  |  |  |  |  |  |  |  |  | 44 |  |  |  |  |  |  |  |  |  |
Net (loss) income | (8,880) |  |  |  |  |  |  |  |  |  |  |  |  |  | (8,880) |  |  |  |  |  |
Foreign currency translation | 105 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total comprehensive loss | 141 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 141 |  |  |
Balance at Sep. 30, 2018 | (4,865) |  |  |  | $ 0 |  |  |  |  | $ (51) | 328,266 |  |  |  | (333,185) |  |  | 105 |  |  |
Balance (in shares) at Sep. 30, 2018 |  |  |  |  | 8,138 |  |  |  |  | (1) |  |  |  |  |  |  |  |  |  |  |
Balance at Dec. 31, 2018 | (14,939) |  |  |  | $ 0 |  |  |  |  | $ 0 | 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 | 54 |  |  |  |  |  |  |  |  |  | 54 |  |  |  |  |  |  |  |  |  |
Compensation expense for issuance of restricted stock | 4 |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |  |  |  |
Compensation expense for issuance of restricted stock (in shares) |  |  |  |  | 20 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise of Pre-Funded Series D Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (41)
Exercise of pre-funded Series D Warrants (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,885 |
Issuance of Preferred Stock |  | $ 150 |  |  |  |  |  |  |  |  |  | $ 150 |  |  |  |  |  |  |  |  |
Issuance of Preferred Stock (in shares) |  |  |  |  |  |  | 15 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) income | (7,894) |  |  |  |  |  |  |  |  |  |  |  |  |  | (7,894) |  |  |  |  |  |
Retirement of Series D Preferred Stock | (1,160) |  |  |  |  |  |  |  |  |  | (1,160) |  |  |  |  |  |  |  |  |  |
Retirement of Series D Preferred Stock (in Shares) |  |  |  |  |  | (116) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total comprehensive loss | 7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 |  |  |
Balance at Mar. 31, 2019 | (23,778) |  |  |  | $ 0 |  |  |  |  |  | 328,113 |  |  |  | (351,948) |  |  | 57 |  |  |
Balance (in shares) at Mar. 31, 2019 |  |  |  |  | 20,620 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at Dec. 31, 2018 | $ (14,939) |  |  |  | $ 0 |  |  |  |  | $ 0 | 329,065 |  |  |  | (344,054) |  |  | 50 |  |  |
Balance (in shares) at Dec. 31, 2018 |  |  |  |  | 14,715 | 101 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange of warrants for common stock (in shares) | 82,521 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) income | $ (21,371) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation | 39 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at Sep. 30, 2019 | (18,825) |  |  |  | $ 0 |  |  |  |  |  | 364,750 |  |  |  | (383,664) |  |  | 89 |  |  |
Balance (in shares) at Sep. 30, 2019 |  |  |  |  | 26,112 | 42,082 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at Mar. 31, 2019 | (23,778) |  |  |  | $ 0 |  |  |  |  |  | 328,113 |  |  |  | (351,948) |  |  | 57 |  |  |
Balance (in shares) at Mar. 31, 2019 |  |  |  |  | 20,620 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation expense for issuance of stock options | 75 |  |  |  |  |  |  |  |  |  | 75 |  |  |  |  |  |  |  |  |  |
Exercise of Pre-Funded Series D Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (1) |  | $ (39)
Exercise of pre-funded Series D Warrants (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,400 |
Exchange of warrants for common stock | 14 |  |  |  |  |  |  |  |  |  | 14 |  |  |  |  |  |  |  |  |  |
Exchange of warrants for common stock (in shares) |  |  |  |  | 92 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) income | (5,959) |  |  |  |  |  |  |  |  |  |  |  |  |  | (5,959) |  |  |  |  |  |
Total comprehensive loss | (80) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (80) |  |  |
Balance at Jun. 30, 2019 | (29,729) |  |  |  | $ 0 |  |  |  |  |  | 328,201 |  |  |  | (357,907) |  |  | (23) |  |  |
Balance (in shares) at Jun. 30, 2019 |  |  |  |  | 26,112 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation expense for issuance of stock options | 70 |  |  |  |  |  |  |  |  |  | 70 |  |  |  |  |  |  |  |  |  |
Fair value of warrants issued | (20,844) |  |  |  |  |  |  |  |  |  | (20,844) |  |  |  |  |  |  |  |  |  |
Issuance of Preferred Stock |  |  | $ 29,575 | $ 9,510 |  |  |  |  |  |  |  |  | $ 42,915 | $ 14,408 |  | $ (13,340) | $ (4,898) |  |  |  |
Issuance of Preferred Stock (in shares) |  |  |  |  |  |  |  | 32,572 | 9,510 |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) income | (7,519) |  |  |  |  |  |  |  |  |  |  |  |  |  | (7,519) |  |  |  |  |  |
Foreign currency translation | 89 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total comprehensive loss | 112 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 112 |  |  |
Balance at Sep. 30, 2019 | $ (18,825) |  |  |  | $ 0 |  |  |  |  |  | $ 364,750 |  |  |  | $ (383,664) |  |  | $ 89 |  |  |
Balance (in shares) at Sep. 30, 2019 |  |  |  |  | 26,112 | 42,082 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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