Quarterly report pursuant to Section 13 or 15(d)

Summary of Fair Value Warrant Derivative Liability and Related Common Shares (Detail)

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Summary of Fair Value Warrant Derivative Liability and Related Common Shares (Detail) - USD ($)
Feb. 28, 2017
Nov. 30, 2016
Sep. 15, 2016
May 31, 2015
Feb. 06, 2015
Sep. 26, 2014
Derivative [Line Items]            
Total derivative liability [1] $ 3,982,400          
Shares indexed to derivative liability 7,733,334 7,733,334 7,733,334      
AVCP Convertible Notes            
Derivative [Line Items]            
Total derivative liability       $ 2,008,907 $ 403,266 $ 767,038
Shares indexed to derivative liability       5,185,185 1,500,000 2,000,000
Warrants (equity allocation)            
Derivative [Line Items]            
Total derivative liability $ 3,982,400 $ 3,955,734 $ 5,179,200      
[1] The Company did not have any assets or liabilities measured at fair value using Level 1 or 2 of the fair value hierarchy as of February 28, 2017 and May 31, 2016.