Annual report pursuant to Section 13 and 15(d)

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

v3.7.0.1
Summary of Fair Value Warrant Derivative Liability and Related Common Shares (Detail) - USD ($)
 12 Months Ended
Jun. 24, 2015
May 31, 2017
May 31, 2016
May 31, 2015
Sep. 15, 2016
Feb. 06, 2015
Sep. 26, 2014
Derivative [Line Items]              
Beginning Balance   $ 0          
Ending Balance   $ 3,014,667 [1] $ 0        
AVCP Convertible Notes              
Derivative [Line Items]              
Shares indexed       5,185,185   1,500,000 2,000,000
Change in fair value, shares       1,685,185      
Beginning Balance     2,008,907 $ 0      
Conversion of notes payable, shares (5,185,185)            
Change in fair value, amount     (646,505) 838,643      
Conversion of notes payable June 24, 2015     (1,362,402)        
Ending Balance       2,008,907      
AVCP Convertible Notes | At September 26, 2014              
Derivative [Line Items]              
Inception date       767,038      
AVCP Convertible Notes | At February 6, 2015              
Derivative [Line Items]              
Inception date       $ 403,226      
Registered Direct Equity Offering | Investor Warrants Issued with Registered Direct Equity Offering              
Derivative [Line Items]              
Shares indexed   7,733,334     7,733,334    
Beginning Balance   $ 0          
Inception date   5,179,200          
Ending Balance   $ 3,014,667 $ 0        
[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 May 31, 2017 and May 31, 2016.