• Filing Date: 2020-07-09
  • Form Type: 10-Q
  • Description: Quarterly report
v3.20.2
5.0% Senior Unsecured Convertible Notes (Details)
3 Months Ended 6 Months Ended
Dec. 11, 2019
USD ($)
Jul. 28, 2017
USD ($)
d
$ / shares
Jul. 26, 2017
May 31, 2020
USD ($)
May 31, 2019
USD ($)
May 31, 2020
USD ($)
May 31, 2019
USD ($)
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       $ 0 $ 0 $ 2,815,000 $ 0      
5.0% Convertible Notes                    
Debt Instrument [Line Items]                    
Stated interest rate percentage       5.00% 5.00% 5.00% 5.00%      
Convertible notes, net of discount       $ 64,097,000   $ 64,097,000   $ 71,022,000    
New Convertible Notes                    
Debt Instrument [Line Items]                    
Debt issued   $ 40,000,000.0             $ 70,000,000.0  
Convertible Notes | 5.0% Convertible Notes                    
Debt Instrument [Line Items]                    
Percentage of holders tendering exchange offer, minimum (as percent)     98.00%              
Stated interest rate percentage 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                  
Carrying value of debt       67,800,000   67,800,000        
Convertible notes, net of discount       64,100,000   64,100,000        
Debt unamortized discount       3,300,000   3,300,000        
Debt unamortized issuance cost       483,000   483,000        
Interest expense debt       1,200,000 $ 1,300,000 2,300,000 $ 2,500,000      
Interest included in interest expense       848,000 948,000 1,700,000 1,900,000      
Amortization of debt discounts       277,000 285,000 494,000 541,000      
Amortization of debt origination costs       $ 41,000 $ 42,000 $ 73,000 $ 80,000      
Convertible Notes | New Convertible Notes                    
Debt Instrument [Line Items]                    
Debt issued   $ 75,800,000                
Stated interest rate percentage                   5.00%
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                
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%                
[1] Derived from audited consolidated financial statements.