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Subsequent Events - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
Oct. 30, 2018
Nov. 14, 2018
Sep. 30, 2018
Jun. 01, 2018
Jan. 31, 2018
Subsequent Event [Line Items]          
Warrants exercisable into shares of common stock       1,183,116 570,287
Exercise price of warrants, per share     $ 3.66 $ 3.02 $ 9.15
Subsequent Events [Member]          
Subsequent Event [Line Items]          
Additional shares of common stock issued for conversions of preferred stock   115,000      
Subsequent Events [Member] | Unsecured Convertible Notes and Warrants [Member]          
Subsequent Event [Line Items]          
Repayments of debt $ 4.0        
Notes payable, interest rate 12.00%        
Convertible notes term 12 months        
Debt instrument conversion price $ 4.25        
Warrants exercisable into shares of common stock 0.5        
Exercise price of warrants, per share $ 4.25