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Convertible Notes, Net - Narrative (Details)
1 Months Ended 3 Months Ended 9 Months Ended
May 31, 2018
USD ($)
$ / shares
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
May 15, 2018
$ / shares
Debt Instrument [Line Items]              
Affiliate expenses   $ 7,541,000 $ 5,694,000 $ 22,060,000 $ 17,751,000    
Accrued interest payable   $ 7,495,000   $ 7,495,000   $ 5,381,000  
Notes Due in 2023              
Debt Instrument [Line Items]              
Debt instrument, interest rate, effective percentage   6.92%   6.92%      
Convertible Notes Payable              
Debt Instrument [Line Items]              
Principal   $ 143,750,000   $ 143,750,000   143,750,000  
Deferred financing costs   $ 1,664,000   $ 1,664,000   2,431,000  
Convertible Notes Payable | Notes Due in 2023              
Debt Instrument [Line Items]              
Principal $ 143,750,000            
Debt instrument, interest rate, stated percentage 6.125% 6.125%   6.125%      
Deferred financing costs $ 5,100,000            
Debt instrument, conversion ratio 0.0439386            
Debt Instrument, convertible, conversion price (usd per share) | $ / shares $ 22.76            
Debt instrument, convertible, conversion premium 10.00%            
Debt instrument, convertible, conversion price less premium (usd per share) | $ / shares             $ 20.69
Amortization of debt discount $ 1,800,000            
Debt instrument, interest rate, effective percentage 6.50%            
Accrued interest payable   $ 3,300,000   $ 3,300,000   $ 1,100,000  
KKR Credit & Markets | Convertible debt              
Debt Instrument [Line Items]              
Affiliate expenses $ 800,000