Annual report pursuant to Section 13 and 15(d)

Registered Direct Equity Offerings - Additional Information (Detail)

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Registered Direct Equity Offerings - Additional Information (Detail) - USD ($)
 1 Months Ended 12 Months Ended
Jan. 31, 2017
Dec. 12, 2016
Feb. 28, 2017
Sep. 30, 2016
May 31, 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
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 1,066,667 576,451
Class of warrants, exercise price $ 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   4,000,000   13,333,334  
Purchase price, per share   $ 0.75   $ 0.75  
Warrants to purchase common shares, shares   2,000,000   6,666,667 5,602,821
Class of warrants, exercise price   $ 1.00   $ 1.00 $ 1.00
Term of warrants   5 years   5 years 5 years
Proceeds from issuance of common shares   $ 3,000,000   $ 8,990,000  
Placement agent's fees, as a percentage of gross proceeds       8.00%  
Subscription Agreements          
Stockholders Equity Note [Line Items]          
Number of shares to be sold 1,534,999   5,670,661    
Purchase price, per share $ 0.75   $ 0.75    
Warrants to purchase common shares, shares 767,498   2,835,323    
Class of warrants, exercise price $ 1.00   $ 1.00    
Term of warrants 5 years   5 years    
Proceeds from issuance of common shares $ 1,000,000   $ 3,800,000    
Placement agent's fees, as a percentage of gross proceeds 9.00%   9.00%