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Fair Value Measurements (Estimated Fair Values of Financial Instruments) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Financial assets:        
Cash and cash equivalents $ 6,151 $ 6,410    
Notes receivable, net 824 1,086    
Warrants, fair value 702 731    
Financial liabilities:        
Non-recourse debt 3,198 3,516    
Carrying Amount [Member]        
Financial assets:        
Cash and cash equivalents 6,151 6,410    
Notes receivable, net 805 1,078    
Warrants, fair value 702 731    
Financial liabilities:        
Non-recourse debt 3,180 3,508    
Fair Value, Inputs, Level 1 [Member]        
Financial assets:        
Cash and cash equivalents 6,151 6,410    
Fair Value, Inputs, Level 3 [Member]        
Financial assets:        
Notes receivable, net 824 1,086    
Warrants, fair value 702 731 $ 298 $ 302
Financial liabilities:        
Non-recourse debt $ 3,198 $ 3,516