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Fair Value Measurements - Additional Information (Details)
9 Months Ended
Aug. 31, 2019
USD ($)
Aug. 31, 2018
USD ($)
Nov. 30, 2018
$ / shares
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Cash equivalents maximum maturity period 3 months    
Change in fair value remeasurement of contingent consideration liability $ (19,034,000) $ 0  
Transfers between fair value measurement category levels $ 0    
Maximum      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Held-to-maturity securities, maturity period 1 year    
Other Income (Expense), Net      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Change in fair value remeasurement of contingent consideration liability $ (19,034,000)    
Loss on settlement of outstanding convertible debentures $ 1,559,000    
Stock Volatility      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Convertible debentures conversion option measurement input     0.35
Risk Free Rate      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Convertible debentures conversion option measurement input     0.027
Discount Rate      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Convertible debentures conversion option measurement input     0.046
Dividend Yields      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Convertible debentures conversion option measurement input | $ / shares     0.35