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Credit Facilities (5.00% Convertible Senior Notes due 2024) (Details)
12 Months Ended
Apr. 03, 2019
USD ($)
day
$ / shares
Dec. 31, 2019
USD ($)
shares
Mar. 31, 2019
Dec. 31, 2018
USD ($)
Aug. 09, 2018
USD ($)
Nov. 02, 2015
Line of Credit Facility [Line Items]            
Stock trigger price (usd per share) | $ / shares $ 6.61          
Maximum equity owned by Investor   9.50%        
Carrying value   $ 182,666,000   $ 198,078,000    
Convertible notes            
Line of Credit Facility [Line Items]            
Debt, conversion option   41,200,000.0        
5% Note | Convertible notes            
Line of Credit Facility [Line Items]            
Debt instrument, stated interest rate 5.00%   5.00%      
Debt instrument face amount $ 25,000,000.0          
Maximum conversion amount 30.00%          
Limit on conversion 30.00%          
Convertible debt, conversion ratio 0.15129          
Mandatory conversion of shares $ 1,666,666          
Convertible debt redemption, consecutive trading days threshold | day 5          
Carrying value   67,200,000.0        
Debt issuance costs, line of credit arrangements, gross   1,200,000.0        
Deferred financing cost   500,000.0        
Reduction in equity $ 700,000.0          
Debt conversion, converted instrument, amount   5,000,000.0        
Debt conversion, converted amount, carrying value   2,000,000.0        
Debt conversion, accrued interest   $ 67,000        
Debt conversion, converted instrument, shares issued | shares   766,652        
Convertible notes payable   $ 26,500,000.0        
Debt issuance costs, gross   $ 400,000.0        
Convertible Senior Notes Due 2020            
Line of Credit Facility [Line Items]            
Debt instrument, stated interest rate   3.25%     3.25%  
Convertible Senior Notes Due 2020 | Convertible notes            
Line of Credit Facility [Line Items]            
Debt instrument, stated interest rate         3.25% 3.25%
Debt instrument face amount         $ 40,500,000.0  
Debt issuance costs, gross   $ 100,000        
Voluntary Conversion            
Line of Credit Facility [Line Items]            
Stock trigger price (usd per share) | $ / shares $ 7.271          
Voluntary Conversion | Convertible notes            
Line of Credit Facility [Line Items]            
Conversion price (USD per share) | $ / shares $ 8.2624          
Convertible debt, conversion ratio 0.12103          
Two Investors | 5% Note | Convertible notes            
Line of Credit Facility [Line Items]            
Debt instrument face amount $ 42,000,000.0          
Two Investors | 5% Note | Face Value Per Note            
Line of Credit Facility [Line Items]            
Convertible debt, conversion ratio   0.9        
Two Investors | Convertible Senior Notes Due 2020 | Face Value Per Note            
Line of Credit Facility [Line Items]            
Convertible debt, conversion ratio   1        
Minimum | 5% Note | Convertible notes            
Line of Credit Facility [Line Items]            
Periodic payment, interest   $ 4,400,000.0        
Minimum | Convertible Senior Notes Due 2020 | Convertible notes            
Line of Credit Facility [Line Items]            
Periodic payment, interest   721,000        
Maximum | 5% Note | Convertible notes            
Line of Credit Facility [Line Items]            
Periodic payment, interest   14,700,000.0        
Maximum | Convertible Senior Notes Due 2020 | Convertible notes            
Line of Credit Facility [Line Items]            
Periodic payment, interest   $ 842,000