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Common Stock - Authorized - Additional Information (Detail) | May 23, 2018 $ / shares shares | Sep. 30, 2019 $ / shares shares | Dec. 31, 2018 $ / shares shares | May 22, 2018 shares
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Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |  |  |  |
Common stock, shares authorized | shares | 150,000,000 | 150,000,000 | 150,000,000 | 75,000,000
Common stock, par value | $ / shares | $ 0.001 | $ 0.001 | $ 0.001 |
Preferred stock, shares authorized | shares |  | 5,000,000 | 5,000,000 |
Preferred stock, par value | $ / shares |  | $ 0.001 | $ 0.001 |
Reverse stock split ratio | 0.1 |  |  |

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