Quarterly report pursuant to Section 13 or 15(d)

Assumptions used in Estimating Fair Value of Convertible Note Redemption Provision Derivative Liability (Detail)

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Assumptions used in Estimating Fair Value of Convertible Note Redemption Provision Derivative Liability (Detail)
 6 Months Ended
Nov. 15, 2018
$ / shares
Nov. 30, 2018
$ / shares
Fair value of underlying stock    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Embedded derivative liability, price per share $ 0.57 $ 0.58
Risk free rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Embedded Derivative Liability, Measurement Input 0.0278 0.0278
Expected Term (In Years)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Embedded derivative liability, expected term 1 year 7 months 9 days 1 year 7 months 9 days
Stock price volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Embedded Derivative Liability, Measurement Input 0.588 0.588
Expected dividend yield    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Embedded derivative liability, dividend yield 0.00% 0.00%
Discount factor    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Embedded Derivative Liability, Measurement Input 0.85 0.85