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Related Party Transactions - Management Agreement (Details) - SP General Services LLC - USD ($)
$ in Thousands
3 Months Ended 4 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Jun. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Related Party Transaction [Line Items]            
Management fee percentage, quarterly basis       1.50%    
Management agreement renewal, term       1 year    
Notice period prior to management agreement renewal, period       60 days    
Management Fee            
Related Party Transaction [Line Items]            
Services fees and reimbursable expenses $ 2,203 $ 1,461   $ 6,412 $ 2,642  
Unpaid amount for management fee 105     105   $ 2,319
Management Fee, Reinstated            
Related Party Transaction [Line Items]            
Services fees and reimbursable expenses     $ 2,186      
Reimbursable Expenses            
Related Party Transaction [Line Items]            
Services fees and reimbursable expenses 948 $ 509   2,934 $ 1,661  
Deferred fees payable to related party $ 975     $ 975   $ 1,594