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Stockholders' Equity - Additional Information (Detail) - $ / shares | Dec. 31, 2018 | Aug. 06, 2018 | Jan. 22, 2018 | Dec. 31, 2017
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Class of Stock [Line Items] |  |  |  |
Preferred stock, shares authorized (in shares) | 2,000,000 |  |  | 2,000,000
Preferred stock, par value (in dollars per share) | $ 0.001 |  |  | $ 0.001
Preferred stock, shares outstanding (in shares) | 0 |  |  | 0
Preferred stock, shares issued (in shares) | 0 |  |  | 0
Number of rights issued per common stock (in shares) |  |  | 1 |
Exercise price per share (in dollars per share) |  | $ 2.52 |  |
Series D Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock, shares authorized (in shares) | 150,000 |  |  |
Preferred stock, par value (in dollars per share) |  |  | $ 0.001 |
Exercise price per share (in dollars per share) |  |  | $ 10.00 |
Number of preferred shares issued from exercise of right (in shares) |  |  | 0.001 |

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