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Debt - Additional Information (Details)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended
May 14, 2018
day
$ / shares
Jul. 31, 2017
USD ($)
day
$ / shares
Dec. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Nov. 30, 2018
CAD ($)
May 31, 2018
USD ($)
Debt Instrument [Line Items]              
Principal amount     $ 317,066,000        
Carrying amount     254,535,000 $ 251,229,000 $ 241,424,000    
2024 Convertible Notes              
Debt Instrument [Line Items]              
Stated interest rate   2.875%          
Principal amount   $ 143,750,000          
2024 Convertible Notes | Common Stock Class A Non-voting              
Debt Instrument [Line Items]              
Conversion rate per $1,000 principal amount   0.1          
Conversion price, per share (in dollars per share) | $ / shares   $ 10.00          
2024 Convertible Notes | Additional Paid-in Capital              
Debt Instrument [Line Items]              
Equity component of debt, gross     39,800,000        
Carrying amount     $ 25,300,000        
Effective interest rate     9.00%        
2024 Convertible Notes | Senior Notes              
Debt Instrument [Line Items]              
Principal amount     $ 143,750,000        
Carrying amount     118,736,000 117,193,000 112,740,000    
2024 Convertible Notes | Debt Conversion, Condition One | Senior Notes              
Debt Instrument [Line Items]              
Trading days threshold | day   20          
Consecutive trading day threshold | day   30          
2025 Convertible Notes              
Debt Instrument [Line Items]              
Stated interest rate 2.375%           2.375%
Principal amount             $ 172,500,000
2025 Convertible Notes | Additional Paid-in Capital              
Debt Instrument [Line Items]              
Equity component of debt, gross     49,600,000        
2025 Convertible Notes | Senior Notes              
Debt Instrument [Line Items]              
Principal amount     172,500,000        
Carrying amount     $ 134,983,000 133,164,000 127,902,000    
Effective interest rate     9.00%        
Conversion rate per $1,000 principal amount 0.0628931            
Conversion price, per share (in dollars per share) | $ / shares $ 15.90            
Share price (in dollars per share) | $ / shares $ 15.90            
2025 Convertible Notes | Senior Notes | Additional Paid-in Capital              
Debt Instrument [Line Items]              
Equity component of debt     $ 39,100,000        
2025 Convertible Notes | Debt Conversion, Condition One | Senior Notes              
Debt Instrument [Line Items]              
Trading days threshold | day 20            
Consecutive trading day threshold | day 30            
CASHMAX secured borrowing facility | Receivables Securitization Facility              
Debt Instrument [Line Items]              
Carrying amount     $ 0 $ 0 $ (260,000)    
CASHMAX secured borrowing facility | Receivables Securitization Facility | Variable Interest Entity, Primary Beneficiary              
Debt Instrument [Line Items]              
Maximum borrowing amount           $ 25