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Outstanding Loans and Security Agreements - Non-recourse Debt Facilities (Additional Information) (Details)
1 Months Ended 12 Months Ended
Jun. 30, 2018
Sep. 30, 2013
USD ($)
Mar. 31, 2013
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2017
USD ($)
Feb. 28, 2017
USD ($)
Jun. 30, 2015
USD ($)
lender
Jul. 31, 2014
USD ($)
Dec. 31, 2012
USD ($)
Debt Instrument [Line Items]                        
Interest rate percentage       6.00%                
Unused borrowing capacity       $ 1,220,000 $ 1,220,000              
Notes | Notes due July 2024, Recourse                        
Debt Instrument [Line Items]                        
Interest rate percentage       10.00%                
Debt face amount               $ 100,000,000        
Senior secured notes | Senior Secured Notes due March 2030, Non-Recourse                        
Debt Instrument [Line Items]                        
Interest rate percentage       6.07%                
Term loan | Term Loan due September 2028, Non-Recourse                        
Debt Instrument [Line Items]                        
Interest rate percentage       7.50%                
Term loan | Term Loan due October 2020, Non-Recourse | LIBOR                        
Debt Instrument [Line Items]                        
LIBOR margin (as a percentage)       5.25%                
Term loan | Term Loan due December 2021, Non-Recourse | LIBOR                        
Debt Instrument [Line Items]                        
LIBOR margin (as a percentage)       2.50%                
PPA II                        
Debt Instrument [Line Items]                        
Debt repayment—principal       $ 144,813,000 65,114,000 $ 53,726,000            
PPA II | Senior secured notes | Senior Secured Notes due March 2025, Non-Recourse                        
Debt Instrument [Line Items]                        
Interest rate percentage     5.22% 5.22%                
Total amount of loan proceeds     $ 144,800,000                  
Debt repayment—principal     28,800,000                  
Debt proceeds used for debt service reserves and issuance costs     21,700,000                  
Debt used to fund remaining system purchases     $ 94,300,000                  
Debt minimum debt service reserves required         11,200,000              
Debt face amount             $ 77,600,000          
PPA IIIa                        
Debt Instrument [Line Items]                        
Debt repayment—principal       $ 6,631,000 4,431,000 3,041,000            
PPA IIIa | Term loan | Term Loan due September 2028, Non-Recourse                        
Debt Instrument [Line Items]                        
Interest rate percentage                       7.50%
Debt minimum debt service reserves required       3,800,000 3,700,000              
Debt face amount                       $ 46,800,000
PPA IIIb                        
Debt Instrument [Line Items]                        
Debt repayment—principal       28,676,000 3,953,000 3,077,000            
PPA IIIb | Term loan | Term Loan due October 2020, Non-Recourse                        
Debt Instrument [Line Items]                        
Debt minimum debt service reserves required       1,800,000 1,700,000              
Debt face amount   $ 32,500,000                    
PPA IIIb | Term loan | Term Loan due October 2020, Non-Recourse | LIBOR                        
Debt Instrument [Line Items]                        
LIBOR margin (as a percentage)   5.20%                    
PPA IV                        
Debt Instrument [Line Items]                        
Debt repayment—principal       $ 18,012,000 15,543,000 13,697,000            
PPA IV | Senior secured notes | Senior Secured Notes due March 2030, Non-Recourse                        
Debt Instrument [Line Items]                        
Interest rate percentage       6.07%             6.07%  
Debt minimum debt service reserves required       $ 8,000,000 7,500,000              
Debt face amount                     $ 99,000,000  
PPA V                        
Debt Instrument [Line Items]                        
Debt repayment—principal       9,453,000 5,780,000 $ 2,834,000            
PPA V | Term loan | Term Loan due December 2021, Non-Recourse                        
Debt Instrument [Line Items]                        
Debt face amount                   $ 131,200,000    
Number of lenders | lender                   5    
Commitment fee percentage 0.50%                      
PPA V | Term loan | Term Loan due December 2021, Years One Through Three, Non-Recourse | LIBOR                        
Debt Instrument [Line Items]                        
LIBOR margin (as a percentage) 2.25%                      
PPA V | Term loan | Term Loan due December 2021, After Year Three, Non-Recourse | LIBOR                        
Debt Instrument [Line Items]                        
LIBOR margin (as a percentage) 2.50%                      
Letters of Credit | PPA V                        
Debt Instrument [Line Items]                        
Maximum borrowing capacity                 $ 6,200,000 $ 6,400,000    
Amount outstanding       5,000,000 5,000,000              
Unused borrowing capacity       $ 1,200,000 $ 1,200,000