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Financing Receivables - Components (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Jul. 09, 2021
Dec. 31, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Participation interest in loan pool 5.00%      
Amounts outstanding $ 71,952   $ 41,752  
Unamortized discount (414)   (893)  
Allowance for credit losses (386)   (246)  
Carrying value 71,152   40,613  
Advances        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Amounts outstanding 67,077   35,401  
Unamortized discount 0   0  
Allowance for credit losses (238) $ (211) (121) $ (215)
Carrying value 66,839   35,280  
Advances, not associated with specific installation projects        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Carrying value 9,000      
Loans and Loan Participations        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Amounts outstanding 4,875   6,351  
Unamortized discount (414)   (893)  
Allowance for credit losses (148) (111) (125) (96)
Carrying value $ 4,313 $ 4,712 $ 5,333 $ 5,130
Residential solar loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Participation interest in loan pool 5.00%   5.00%  
Amounts outstanding $ 4,600   $ 6,000  
Indirect Channel Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Amounts outstanding $ 300   $ 400