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Consolidated Statements of Stockholders' Equity (Deficit) - USD ($) $ in Thousands | Total | Series D Preferred Stock [Member] | Common Stock Issued [Member] | Common Stock Issued [Member] Scenario, Previously Reported [Member] | Preferred Stock Issued [Member] | Preferred Stock Issued [Member] Series D Preferred Stock [Member] | Treasury Stock [Member] | Additional Paid in Capital [Member] | Additional Paid in Capital [Member] Scenario, Previously Reported [Member] | Additional Paid in Capital [Member] Series D Preferred Stock [Member] | Accumulated Deficit [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Series D Warrants [Member] | Series D Warrants [Member] Common Stock Issued [Member] | Series D Warrants [Member] Additional Paid in Capital [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
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 |  |  |  |  |  |  | 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) |  |  | 262,462 |  |  |  |  |  |  |  |  |  |  |  |
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) |  |  | 736 |  |  |  |  |  |  |  |  |  |  |  |
Fair value of warrants exercised | 2,552 |  |  |  |  |  |  | 2,552 |  |  |  |  |  |  |
Adjustment for rounding related to Nov 2017 reverse stock split, (in shares) |  |  | 93 |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) income | (45,117) |  |  |  |  |  |  |  |  |  | (45,117) |  |  |  |
Foreign currency translation | 83 |  |  |  |  |  |  |  |  |  |  | 83 |  |  |
Balance at Dec. 31, 2017 | 678 |  | $ 3 | $ 2 |  |  | $ (51) | 325,516 | $ 325,517 |  | (324,832) | 42 |  |  |
Balance (in shares) at Dec. 31, 2017 |  |  | 263,305 | 263,315 |  |  | (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 |  | $ 6 |  |  |  |  | 4,245 |  |  |  |  |  |  |
Sale of common stock, net of expenses (in shares) |  |  | 668,854 |  |  |  |  |  |  |  |  |  |  |  |
Fair value of warrants issued in Feb 2018 public offering | (18,306) |  |  |  |  |  |  | (18,306) |  |  |  |  |  |  |
Net (loss) income | 7,185 |  |  |  |  |  |  |  |  |  | 7,185 |  |  |  |
Balance at Mar. 31, 2018 | (6,205) |  | $ 9 |  |  |  | $ (51) | 311,476 |  |  | (317,647) | 8 |  |  |
Balance (in shares) at Mar. 31, 2018 |  |  | 932,159 |  |  |  | (1) |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total comprehensive loss | (34) |  |  |  |  |  |  |  |  |  |  | (34) |  |  |
Balance at Dec. 31, 2017 | 678 |  | $ 3 | $ 2 |  |  | $ (51) | 325,516 | 325,517 |  | (324,832) | 42 |  |  |
Balance (in shares) at Dec. 31, 2017 |  |  | 263,305 | 263,315 |  |  | (1) |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) income | 527 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation | (78) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at Jun. 30, 2018 | (13,090) |  | $ 9 |  |  |  | $ (51) | 311,293 |  |  | (324,305) | (36) |  |  |
Balance (in shares) at Jun. 30, 2018 |  |  | 932,159 |  |  |  | (1) |  |  |  |  |  |  |  |
Balance at Dec. 31, 2017 | 678 |  | $ 3 | $ 2 |  |  | $ (51) | 325,516 | $ 325,517 |  | (324,832) | 42 |  |  |
Balance (in shares) at Dec. 31, 2017 |  |  | 263,305 | 263,315 |  |  | (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 |  | $ 2 |  |  |  |  | 96 |  |  |  |  |  |  |
Compensation expense for issuance of restricted stock (in shares) |  |  | 164,989 |  |  |  |  |  |  |  |  |  |  |  |
Sale of common stock, net of expenses | 10,916 |  | $ 54 |  |  |  |  | 10,862 |  |  |  |  |  |  |
Sale of common stock, net of expenses (in shares) |  |  | 5,336,665 |  |  |  |  |  |  |  |  |  |  |  |
Fair value of warrants issued in Feb 2018 public offering | (18,306) |  |  |  |  |  |  | (18,306) |  |  |  |  |  |  |
Cashless exercise of warrants (in shares) |  |  | 34,467 |  |  |  |  |  |  |  |  |  |  |  |
Issuance of pre-funded warrants | 520 |  |  |  |  |  |  | 520 |  |  |  |  |  |  |
Exercise of Pre-Funded Series D Warrants |  |  | $ 37 |  |  |  |  | (37) |  |  |  |  |  |  |
Exercise of pre-funded Series D Warrants (in shares) |  |  | 3,675,516 |  |  |  |  |  |  |  |  |  |  |  |
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 Series D Preferred Stock |  | $ 1,004 |  |  |  |  |  |  |  | $ 1,004 |  |  |  |  |
Issuance of Series D Preferred Stock (in shares) |  |  |  |  |  | 101 |  |  |  |  |  |  |  |  |
Exchange of warrants for common stock |  |  | $ 8 |  |  |  |  | (8) |  |  |  |  |  |  |
Exchange of warrants for common stock (in shares) |  |  | 825,002 |  |  |  |  |  |  |  |  |  |  |  |
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) |  | $ 103 |  |  |  | $ 0 | 328,962 |  |  | (344,054) | 50 |  |  |
Balance (in shares) at Dec. 31, 2018 |  |  | 10,299,954 |  | 101 |  |  |  |  |  |  |  |  |  |
Balance at Mar. 31, 2018 | (6,205) |  | $ 9 |  |  |  | $ (51) | 311,476 |  |  | (317,647) | 8 |  |  |
Balance (in shares) at Mar. 31, 2018 |  |  | 932,159 |  |  |  | (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) |  |  |  |
Foreign currency translation | (36) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at Jun. 30, 2018 | (13,090) |  | $ 9 |  |  |  | $ (51) | 311,293 |  |  | (324,305) | (36) |  |  |
Balance (in shares) at Jun. 30, 2018 |  |  | 932,159 |  |  |  | (1) |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total comprehensive loss | (44) |  |  |  |  |  |  |  |  |  |  | (44) |  |  |
Balance at Dec. 31, 2018 | (14,939) |  | $ 103 |  |  |  | $ 0 | 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 |  |  |  |  |  |  |  |  |  |  |  |
Exercise of Pre-Funded Series D Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 41 | $ (41)
Exercise of pre-funded Series D Warrants (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,119,500 |
Issuance of Series D Preferred Stock |  | $ 150 |  |  |  |  |  |  |  | $ 150 |  |  |  |  |
Issuance of Series D Preferred Stock (in shares) |  |  |  |  |  | 15 |  |  |  |  |  |  |  |  |
Net (loss) income | (7,894) |  |  |  |  |  |  |  |  |  | (7,894) |  |  |  |
Balance at Mar. 31, 2019 | (23,778) |  | $ 144 |  |  |  |  | 327,969 |  |  | (351,948) | 57 |  |  |
Balance (in shares) at Mar. 31, 2019 |  |  | 14,434,454 |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 Dec. 31, 2018 | $ (14,939) |  | $ 103 |  |  |  | $ 0 | 328,962 |  |  | (344,054) | 50 |  |  |
Balance (in shares) at Dec. 31, 2018 |  |  | 10,299,954 |  | 101 |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange of warrants for common stock (in shares) | 64,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) income | $ (13,853) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation | (74) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at Jun. 30, 2019 | (29,729) |  | $ 183 |  |  |  |  | 328,018 |  |  | (357,907) | (23) |  |  |
Balance (in shares) at Jun. 30, 2019 |  |  | 18,277,807 |  |  |  |  |  |  |  |  |  |  |  |
Balance at Mar. 31, 2019 | (23,778) |  | $ 144 |  |  |  |  | 327,969 |  |  | (351,948) | 57 |  |  |
Balance (in shares) at Mar. 31, 2019 |  |  | 14,434,454 |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation expense for issuance of stock options | 75 |  |  |  |  |  |  | 75 |  |  |  |  |  |  |
Exercise of Pre-Funded Series D Warrants |  |  |  |  |  |  |  |  |  |  |  |  | $ (1) | $ 38 | $ (39)
Exercise of pre-funded Series D Warrants (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,779,353 |
Exchange of warrants for common stock | 14 |  | $ 1 |  |  |  |  | 13 |  |  |  |  |  |  |
Exchange of warrants for common stock (in shares) |  |  | 64,000 |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) income | (5,959) |  |  |  |  |  |  |  |  |  | (5,959) |  |  |  |
Foreign currency translation | (23) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at Jun. 30, 2019 | (29,729) |  | $ 183 |  |  |  |  | $ 328,018 |  |  | $ (357,907) | (23) |  |  |
Balance (in shares) at Jun. 30, 2019 |  |  | 18,277,807 |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total comprehensive loss | $ (80) |  |  |  |  |  |  |  |  |  |  | $ (80) |  |  |

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