Quarterly report pursuant to Section 13 or 15(d)

Registered Direct Equity Offerings - Additional Information (Detail)

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Registered Direct Equity Offerings - Additional Information (Detail) - USD ($)
1 Months Ended 9 Months Ended
Jan. 31, 2017
Dec. 12, 2016
Feb. 28, 2017
Jan. 31, 2017
Sep. 30, 2016
Feb. 28, 2017
Stockholders Equity Note [Line Items]            
Proceeds from issuance of common shares           $ 8,990,000
Warrants issued included in closing costs           1,066,667
Fair value of placement agent warrants     $ 819,200     $ 819,200
Proceeds allocated to financing expense           241,986
Issuance cost incurred           $ 577,214
Placement Agent            
Stockholders Equity Note [Line Items]            
Warrants to purchase common shares, shares 122,799   453,652 122,799 1,066,667 453,652
Class of warrants, exercise price $ 0.825   $ 0.825 $ 0.825 $ 0.825 $ 0.825
Term of warrants 5 years   5 years 5 years 5 years  
Percentage of shares, issued as warrants 8.00%   8.00%   8.00%  
Securities Purchase Agreement            
Stockholders Equity Note [Line Items]            
Number of shares to be sold 1,534,999 4,000,000 5,670,661   13,333,334  
Purchase price, per share $ 0.75 $ 0.75 $ 0.75 $ 0.75 $ 0.75 $ 0.75
Warrants to purchase common shares, shares 767,498 2,000,000 2,835,323 767,498 6,666,667 2,835,323
Class of warrants, exercise price $ 1.00 $ 1.00 $ 1.00 $ 1.00 $ 1.00 $ 1.00
Term of warrants 5 years 5 years 5 years 5 years 5 years  
Proceeds from issuance of common shares $ 1,000,000 $ 3,000,000 $ 3,800,000   $ 8,990,000  
Placement agent's fees, as a percentage of gross proceeds 9.00%   9.00%   8.00%