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Condensed Consolidated Statements of Stockholders' Equity (Deficit) (Unaudited) - USD ($) $ in Thousands | Total | Common Stock [Member] | Preferred Stock [Member] | Additional Paid in Capital [Member] | Accumulated Deficit [Member] | Accumulated Other Comprehensive Income [Member]
--- | --- | --- | --- | --- | --- | ---
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 | 54 |  |  | 54 |  |
Compensation expense for issuance of restricted stock | 4 |  |  | 4 |  |
Compensation expense for issuance of restricted stock (in shares) |  | 20 |  |  |  |
Issuance of Series D Preferred Stock | 150 |  |  | 150 |  |
Issuance of Series D Preferred Stock (in shares) |  |  | 15 |  |  |
Conversion of Series D Preferred Stock to Debt | (1,160) |  |  | (1,160) |  |
Conversion of Series D Preferred Stock to Debt (in shares) |  |  | (116) |  |  |
Exercise of pre-funded warrants (in shares) |  | 5,885 |  |  |  |
Net loss | (7,894) |  |  |  | (7,894) |
Total comprehensive income (loss) | 7 |  |  |  |  | 7
Balance at Mar. 31, 2019 | (23,778) |  |  | 328,113 | (351,948) | 57
Balance (in shares) at Mar. 31, 2019 |  | 20,620 |  |  |  |
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] |  |  |  |  |  |
Net loss | (21,371) |  |  |  |  |
Balance at Sep. 30, 2019 | (18,825) |  |  | 364,750 | (383,664) | 89
Balance (in shares) at Sep. 30, 2019 |  | 26,110 | 42,082 |  |  |
Balance at Mar. 31, 2019 | (23,778) |  |  | 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 warrants (in shares) |  | 5,399 |  |  |  |
Exercise of warrants into common stock | 13 |  |  | 13 |  |
Exercise of warrants into common stock (in shares) |  | 91 |  |  |  |
Net loss | (5,959) |  |  |  | (5,959) |
Total comprehensive income (loss) | (80) |  |  |  |  | (80)
Balance at Jun. 30, 2019 | (29,729) |  |  | 328,201 | (357,907) | (23)
Balance (in shares) at Jun. 30, 2019 |  | 26,110 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Compensation expense for issuance of stock options | 70 |  |  | 70 |  |
Issuance of Series E Preferred Stock | 29,575 |  |  | 42,915 | (13,340) |
Issuance Of Series E Preferred Stock, Shares |  |  | 32,572 |  |  |
Issuance of Series E-1 Preferred Stock | 9,510 |  |  | 14,408 | (4,898) |
Issuance Of Series E1 Preferred Stock, Shares |  |  | 9,510 |  |  |
Fair value of warrants issued | (20,844) |  |  | (20,844) |  |
Net loss | (7,519) |  |  |  | (7,519) |
Total comprehensive income (loss) | 112 |  |  |  |  | 112
Balance at Sep. 30, 2019 | (18,825) |  |  | 364,750 | (383,664) | 89
Balance (in shares) at Sep. 30, 2019 |  | 26,110 | 42,082 |  |  |
Balance at Dec. 31, 2019 | (6,357) | $ 1 |  | 364,785 | (371,171) | 28
Balance (in shares) at Dec. 31, 2019 |  | 67,091 | 41,517 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Compensation expense for issuance of stock options | 25 |  |  | 25 |  |
Compensation expense for issuance of restricted stock | 30 |  |  | 30 |  |
Compensation expense for issuance of restricted stock (in shares) |  | 2,717 |  |  |  |
Conversion of Preferred stock into common stock (in shares) |  | 2,915 | (70) |  |  |
Fractional rounding related to reverse stock split (in shares) |  | 50 |  |  |  |
Registration of Series E and Series E-1 Preferred stock and related warrants | (106) |  |  | (106) |  |
Fair value of warrants reclassified from liability to equity | 6,199 |  |  | 6,199 |  |
Net loss | (7,861) |  |  |  | (7,861) |
Total comprehensive income (loss) | 65 |  |  |  |  | 65
Balance at Mar. 31, 2020 | (8,005) | $ 1 |  | 370,933 | (379,032) | 93
Balance (in shares) at Mar. 31, 2020 |  | 72,773 | 41,447 |  |  |
Balance at Dec. 31, 2019 | $ (6,357) | $ 1 |  | 364,785 | (371,171) | 28
Balance (in shares) at Dec. 31, 2019 |  | 67,091 | 41,517 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Conversion of Preferred stock into common stock (in shares) | 2,000,224 |  |  |  |  |
Exercise of pre-funded warrants (in shares) | 6,000 |  |  |  |  |
Net loss | $ (17,127) |  |  |  |  |
Balance at Sep. 30, 2020 | 3,276 | $ 40 |  | 391,545 | (388,298) | (11)
Balance (in shares) at Sep. 30, 2020 |  | 4,035,558 | 21,473 |  |  |
Balance at Mar. 31, 2020 | (8,005) | $ 1 |  | 370,933 | (379,032) | 93
Balance (in shares) at Mar. 31, 2020 |  | 72,773 | 41,447 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Compensation expense for issuance of restricted stock | 606 | $ 1 |  | 605 |  |
Compensation expense for issuance of restricted stock (in shares) |  | 70,259 |  |  |  |
Conversion of Preferred stock into common stock | (1) | $ 15 |  | (16) |  |
Conversion of Preferred stock into common stock (in shares) |  | 1,549,609 | (15,497) |  |  |
Exercise of pre-funded warrants (in shares) |  | 6,000 |  |  |  |
Public Offering - issuance of common stock and warrants | 19,378 | $ 18 |  | 19,360 |  |
Public Offering - issuance of common stock and warrants (in shares) |  | 1,823,000 |  |  |  |
Net loss | (4,275) |  |  |  | (4,275) |
Total comprehensive income (loss) | (1) |  |  |  |  | (1)
Balance at Jun. 30, 2020 | 7,702 | $ 35 |  | 390,882 | (383,307) | 92
Balance (in shares) at Jun. 30, 2020 |  | 3,521,641 | 25,950 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Conversion of Preferred stock into common stock |  | $ 4 |  | (4) |  |
Conversion of Preferred stock into common stock (in shares) |  | 447,700 | (4,477) |  |  |
Exercise of warrants into common stock | 602 | $ 1 |  | 601 |  |
Exercise of warrants into common stock (in shares) |  | 60,117 |  |  |  |
ATM Offering | 66 |  |  | 66 |  |
ATM Offering, Shares |  | 6,100 |  |  |  |
Net loss | (4,991) |  |  |  | (4,991) |
Total comprehensive income (loss) | (103) |  |  |  |  | (103)
Balance at Sep. 30, 2020 | $ 3,276 | $ 40 |  | $ 391,545 | $ (388,298) | $ (11)
Balance (in shares) at Sep. 30, 2020 |  | 4,035,558 | 21,473 |  |  |

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