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5.0% Senior Unsecured Convertible Notes (Details)
3 Months Ended
Dec. 11, 2019
USD ($)
Jul. 28, 2017
USD ($)
d
$ / shares
Jul. 26, 2017
Feb. 29, 2020
USD ($)
Feb. 28, 2019
USD ($)
Nov. 30, 2019
USD ($)
[1]
Dec. 10, 2018
USD ($)
Apr. 18, 2017
Debt Instrument [Line Items]                
Repayment of convertible debt       $ 4,677,000 $ 0      
Gain on extinguishment of debt       2,815,000 $ 0      
5.0% Senior Unsecured Convertible Notes Due 2023                
Debt Instrument [Line Items]                
Stated interest rate percentage         5.00%      
Convertible notes, net of discount       $ 63,779,000   $ 71,022,000    
New Convertible Notes Indenture                
Debt Instrument [Line Items]                
Debt issued   $ 40,000,000.0         $ 70,000,000.0  
Convertible Notes | 5.0% Senior Unsecured Convertible Notes Due 2023                
Debt Instrument [Line Items]                
Percentage of holders tendering exchange offer, minimum (as percent)     98.00%          
Stated interest rate percentage 5.00%     5.00%       5.00%
Debt repurchased $ 8,000,000              
Repayment of convertible debt 4,800,000              
Debt accrued and unpaid interest payment 123,000              
Gain on extinguishment of debt 2,800,000              
Debt expense for derivative 442,000              
Write off debt origination costs $ 66,000              
Convertible Notes | New Convertible Notes Indenture                
Debt Instrument [Line Items]                
Debt issued   $ 75,800,000            
Debt instrument, required percentage of trustees or holders to declare notes immediately due and payable   25.00%            
Debt instrument, required percentage of principal for each day of default   0.25%            
Debt instrument, additional required percentage of principal for each day of restricted transfer default   0.25%            
Debt instrument, maximum required percentage of principal restricted transfer default   0.50%            
Debt instrument, debt default, special interest percentage of principal   0.50%            
Convertible Notes | 5% Convertible Notes                
Debt Instrument [Line Items]                
Debt instrument, conversion price (in dollars per share) | $ / shares   $ 2.00            
Debt instrument, conversion rate   0.5            
Debt instrument, redemption price, percentage   100.00%            
Debt instrument, convertible, minimum percentage of common stock price (as percent)   120.00%            
Debt instrument, convertible, threshold trading days | d   15            
Debt instrument, convertible, threshold consecutive trading days | d   30            
Carrying value of debt       $ 67,800,000        
Convertible notes, net of discount       63,800,000        
Debt unamortized discount       3,500,000        
Debt unamortized issuance cost       524,000        
Interest expense debt       1,100,000 $ 1,200,000      
Interest included in interest expense       861,000 948,000      
Amortization of debt discounts       217,000 256,000      
Amortization of debt origination costs       $ 32,000 $ 38,000      
[1] Derived from audited consolidated financial statements.