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Intangible Assets - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Aug. 31, 2018
Aug. 31, 2017
Aug. 31, 2018
Aug. 31, 2017
Finite-Lived Intangible Assets, Net [Abstract]        
Amortization expense $ 27,000 $ 9,000 $ 49,000 $ 26,000