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Consolidated Statements of Stockholders' Equity (Deficit) (Parenthetical) | May 02, 2018 | Nov. 06, 2017 | Jun. 30, 2019 $ / shares | 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 | $ 0.01
Preferred stock issued, par value |  |  | $ 0.01 | $ 0.01 | $ 0.01
Reverse stock split ratio | 0.002 | 0.0029 |  |  |

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