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Consolidated Statements of Stockholders' Equity (Deficit) (Parenthetical) | May 02, 2018 | Nov. 06, 2017 | Dec. 31, 2018 $ / shares | Dec. 31, 2017 $ / shares
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Statement Of Stockholders Equity [Abstract] |  |  |  |
Common stock issued, par value |  |  | $ 0.01 | $ 0.01
Preferred stock issued, par value |  |  | $ 0.01 | $ 0.01
Reverse stock split ratio | 0.002 | 0.0029 |  |

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- Definition Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer. + References Reference 1: 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(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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