Subsequent Events - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions |
Oct. 03, 2018 |
Jun. 19, 2018 |
---|---|---|
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 |