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Stockholders' Equity - Warrant Exchange - Additional Information (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Apr. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Loss in exchange of common stock for warrants |  |  | $ 6,000 | $ 2,826,000 | $ 6,000 | $ 2,826,000 | $ 2,826,000 | $ 0
Exchange Agreement [Member] |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Issuance of common stock and rights for payments made in shares on convertible notes payable (in shares) | 64,000 | 800,000 |  |  |  |  |  |
Loss in exchange of common stock for warrants | $ 6,000 |  |  |  |  |  |  |

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