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Subsequent Events - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | Oct. 03, 2018 | Jun. 19, 2018
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Subsequent Event [Line Items] |  |
Exercise price per unit of warrant |  | $ 4.00
Warrant exercisable period |  | 5 years
Subsequent Event [Member] | Direct Offering [Member] |  |
Subsequent Event [Line Items] |  |
Gross proceeds from issuance of common stock | $ 5.6 |
Placement agent fees and offering expenses | 0.6 |
Net proceeds from issuance of common stock | $ 5.0 |
Subsequent Event [Member] | Private Placement [Member] |  |
Subsequent Event [Line Items] |  |
Maximum number of common shares issuable per warrant upon conversion | 0.5 |
Exercise price per unit of warrant | $ 3.1445 |
Warrant exercisable period | 5 years |
Subsequent Event [Member] | Common Stock | Direct Offering [Member] |  |
Subsequent Event [Line Items] |  |
Common stock, shares issued | 1,789,258 |
Shares issued to related party, par value | $ 3.1445 |

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