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Loss Per Share (Details) (Parenthetical) - $ / shares
May 31, 2018
May 31, 2017
Apr. 30, 2017
Shares potentially issuable upon conversion of May 2018 convertible notes (assuming $0.375 price)      
Debt Instrument, Convertible, Conversion Price $ 0.375    
Shares potentially issuable upon conversion of April 2017 convertible notes (assuming $1.00 floor price)      
Debt Instrument Floor Price     $ 1.00
Shares potentially issuable upon conversion of May 2017 convertible notes (assuming $1.00 floor price)      
Debt Instrument Floor Price   $ 1.00