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Nature of Business, Liquidity, Basis of Presentation - (Additional Information) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
May 01, 2020
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2020
Aug. 31, 2020
Subsidiary, Sale of Stock [Line Items]            
Non-recourse debt   $ 118,468     $ 120,846  
Long-term Debt   508,499     390,899  
Comprehensive loss   (34,662) $ (89,856)      
Long-term debt, gross   522,191     527,054  
Accounts receivable [1]   108,328     99,513  
Long-term portion of debt   $ 390,031     $ 270,053  
Sales Revenue, Net | Customer Concentration Risk | Duke Energy            
Subsidiary, Sale of Stock [Line Items]            
Concentration risk, percentage     31.00%      
Sales Revenue, Net | Customer Concentration Risk | SK Engineering & Construction Co., Ltd.            
Subsidiary, Sale of Stock [Line Items]            
Concentration risk, percentage   43.00% 36.00%      
Sales Revenue, Net | Customer Concentration Risk | EdgeWise Energy LLC            
Subsidiary, Sale of Stock [Line Items]            
Concentration risk, percentage   30.00%        
Accounts Receivable | Customer Concentration Risk | SK Engineering & Construction Co., Ltd.            
Subsidiary, Sale of Stock [Line Items]            
Concentration risk, percentage   76.00%     56.00%  
Asia Pacific | Sales Revenue, Net | Geographic Concentration Risk            
Subsidiary, Sale of Stock [Line Items]            
Concentration risk, percentage     43.00% 37.00%    
Recourse debt            
Subsidiary, Sale of Stock [Line Items]            
Non-recourse debt   $ 0     $ 0  
Long-term Debt   290,090     168,008  
Long-term debt, gross   300,000     300,000  
Long-term portion of debt   290,090     168,008  
Convertible Promissory Notes Interest Rate 10% Due December 2021 | Convertible debt            
Subsidiary, Sale of Stock [Line Items]            
Repayments of convertible debt $ 70,000          
Convertible Promissory Notes Interest Rate 10% Due December 2021 | Convertible debt | Affiliated entity            
Subsidiary, Sale of Stock [Line Items]            
Interest rate percentage     10.00%      
2.5% Green Convertible Senior Notes due August 2025 | Senior secured notes            
Subsidiary, Sale of Stock [Line Items]            
Non-recourse debt   0     $ 0  
Interest rate percentage         2.50% 2.50%
Long-term Debt   221,387     $ 99,394  
Long-term debt, gross   230,000     230,000 $ 230,000
Long-term portion of debt   $ 221,387     $ 99,394  
[1] We have variable interest entities, which represent a portion of the consolidated balances recorded within these financial statement line items in the condensed consolidated balance sheets (see Note 11 - Portfolio Financings).