Net Income (Loss) Per Common Share - Additional Information (Detail)	Sep. 29, 2017 shares WarrantHolder	Sep. 29, 2017 WarrantHolder shares	Oct. 03, 2017 shares
Net Income Loss Per Common Share [Line Items]
Number of warrant holders	4
Common Stock | Subsequent Event
Net Income Loss Per Common Share [Line Items]
Shares issuable under warrants granted			1,292,510
Warrant Exchange Agreement
Net Income Loss Per Common Share [Line Items]
Number of warrant holders | WarrantHolder	4	4
Outstanding warrants	9,700,000	9,700,000
Warrant Exchange Agreement | Common Stock | Subsequent Event
Net Income Loss Per Common Share [Line Items]
Shares issuable under warrants granted			1,292,510