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Condensed Consolidated Statements of Stockholders' Deficit (Unaudited) - USD ($) $ in Thousands | Total | Series D Warrants [Member] | Series D Preferred Stock [Member] | Common Stock [Member] | Common Stock [Member] Series D Warrants [Member] | Preferred Stock [Member] | Preferred Stock [Member] Series D Preferred Stock [Member] | Treasury 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] | Accumulated Other Comprehensive Income (Loss) [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2017 | $ 678 |  |  | $ 3 |  |  |  | $ (51) | $ 325,516 |  |  | $ (324,832) | $ 42
Balance (in shares) at Dec. 31, 2017 |  |  |  | 263,305 |  |  |  | (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 | (18,306) |  |  |  |  |  |  |  | (18,306) |  |  |  |
Net (loss) income | 7,185 |  |  |  |  |  |  |  |  |  |  | 7,185 |
Total comprehensive loss | (34) |  |  |  |  |  |  |  |  |  |  |  | (34)
Balance at Mar. 31, 2018 | (6,205) |  |  | $ 9 |  |  |  | $ (51) | 311,476 |  |  | (317,647) | 8
Balance (in shares) at Mar. 31, 2018 |  |  |  | 932,159 |  |  |  | (1) |  |  |  |  |
Balance at Dec. 31, 2017 | 678 |  |  | $ 3 |  |  |  | $ (51) | 325,516 |  |  | (324,832) | 42
Balance (in shares) at Dec. 31, 2017 |  |  |  | 263,305 |  |  |  | (1) |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) income | 527 |  |  |  |  |  |  |  |  |  |  |  |
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 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) |
Total comprehensive loss | (44) |  |  |  |  |  |  |  |  |  |  |  | (44)
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, 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 | (7,894) |  |  |  |  |  |  |  |  |  |  | (7,894) |
Total comprehensive loss | 7 |  |  |  |  |  |  |  |  |  |  |  | 7
Balance at Mar. 31, 2019 | (23,778) |  |  | $ 144 |  |  |  |  | 327,969 |  |  | (351,948) | 57
Balance (in shares) at Mar. 31, 2019 |  |  |  | 14,434,454 |  |  |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange of warrants (in shares) | 64,000 |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) income | $ (13,853) |  |  |  |  |  |  |  |  |  |  |  |
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 | 14 |  |  | $ 1 |  |  |  |  | 13 |  |  |  |
Exchange of warrants (in shares) |  |  |  | 64,000 |  |  |  |  |  |  |  |  |
Net (loss) income | (5,959) |  |  |  |  |  |  |  |  |  |  | (5,959) |
Total comprehensive loss | (80) |  |  |  |  |  |  |  |  |  |  |  | (80)
Balance at Jun. 30, 2019 | $ (29,729) |  |  | $ 183 |  |  |  |  | $ 328,018 |  |  | $ (357,907) | $ (23)
Balance (in shares) at Jun. 30, 2019 |  |  |  | 18,277,807 |  |  |  |  |  |  |  |  |

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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(31)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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Period Type: | instant