Quarterly report pursuant to Section 13 or 15(d)

Capital Stock - Summary of Outstanding Convertible Preferred Stock (Details)

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Capital Stock - Summary of Outstanding Convertible Preferred Stock (Details)
$ in Thousands
May 31, 2017
USD ($)
shares
Class Of Stock [Line Items]  
Temporary equity, aggregate liquidation preference | $ $ 42,075
Series B-1 Convertible Preferred Stock  
Class Of Stock [Line Items]  
Temporary equity, shares authorized 4,773,000
Temporary equity, shares issued 3,848,023
Temporary equity, shares outstanding 3,848,023
Temporary equity, aggregate liquidation preference | $ $ 22,075
Series A-2 Convertible Preferred Stock  
Class Of Stock [Line Items]  
Temporary equity, shares authorized 1,177,000
Temporary equity, shares issued 1,176,423
Temporary equity, shares outstanding 1,176,423
Temporary equity, aggregate liquidation preference | $ $ 20,000