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Nature of Business, Liquidity, Basis of Presentation and Summary of Significant Accounting Policies - (Additional Information) (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 18, 2020
USD ($)
shares
$ / shares
May 01, 2020
USD ($)
Jun. 30, 2020
USD ($)
shares
Jun. 30, 2019
Jun. 30, 2020
USD ($)
shares
Jun. 30, 2019
Dec. 31, 2019
USD ($)
shares
Mar. 31, 2020
USD ($)
$ / shares
Mar. 30, 2020
$ / shares
Subsidiary, Sale of Stock [Line Items]                  
Current portion of debt     $ 26,064   $ 26,064   $ 337,583    
Affiliated entity                  
Subsidiary, Sale of Stock [Line Items]                  
Current portion of debt     $ 0   $ 0   $ 24,683    
Sales Revenue, Net | Customer Concentration Risk | The Southern Company                  
Subsidiary, Sale of Stock [Line Items]                  
Concentration risk, percentage       56.00%   44.00%      
Sales Revenue, Net | Customer Concentration Risk | Duke Energy                  
Subsidiary, Sale of Stock [Line Items]                  
Concentration risk, percentage     32.00%   32.00%        
Sales Revenue, Net | Customer Concentration Risk | SK Engineering & Construction Co., Ltd.                  
Subsidiary, Sale of Stock [Line Items]                  
Concentration risk, percentage     29.00% 21.00% 32.00% 26.00%      
Sales Revenue, Net | Customer Concentration Risk | Nextera Energy [Member]                  
Subsidiary, Sale of Stock [Line Items]                  
Concentration risk, percentage     12.00%            
Accounts Receivable | Customer Concentration Risk | Costco Wholesale Corporation                  
Subsidiary, Sale of Stock [Line Items]                  
Concentration risk, percentage             19.00%    
Accounts Receivable | Customer Concentration Risk | The Kraft Group LLC                  
Subsidiary, Sale of Stock [Line Items]                  
Concentration risk, percentage             17.00%    
Accounts Receivable | Customer Concentration Risk | Kaiser Foundation Hospital                  
Subsidiary, Sale of Stock [Line Items]                  
Concentration risk, percentage           26.00%      
Asia Pacific [Member] | Sales Revenue, Net | Geographic Concentration Risk [Member]                  
Subsidiary, Sale of Stock [Line Items]                  
Concentration risk, percentage     30.00% 21.00% 33.00% 26.00%      
Senior Notes Due 2027 [Member] | Senior secured notes                  
Subsidiary, Sale of Stock [Line Items]                  
Interest rate percentage   10.25%              
Debt face amount   $ 70,000              
Convertible Promissory Notes Interest Rate 6% Due December 2020, Recourse, Amendment | Convertible promissory notes                  
Subsidiary, Sale of Stock [Line Items]                  
Interest rate percentage               10.00% 6.00%
Convertible stock price (in dollars per share) | $ / shares $ 8.00             $ 8.00 $ 11.25
Convertible, number of equity instruments (in shares) | shares 4,700,000                
Debt instrument, unamortized premium $ 3,400                
Additional Convertible Notes | Convertible debt                  
Subsidiary, Sale of Stock [Line Items]                  
Interest rate percentage               10.00%  
Debt face amount               $ 30,000  
Convertible Promissory Notes Interest Rate 10% Due December 2021 | Convertible promissory notes                  
Subsidiary, Sale of Stock [Line Items]                  
Convertible stock price (in dollars per share) | $ / shares               $ 8.00  
Repayments of convertible debt   70,000              
Debt face amount               $ 290,000  
Debt due next quarter     $ 70,000   $ 70,000        
Convertible Promissory Notes Interest Rate 10% Due December 2021 | Convertible promissory notes | Affiliated entity                  
Subsidiary, Sale of Stock [Line Items]                  
Interest rate percentage     10.00%   10.00%     10.00%  
Convertible Promissory Notes Interest Rate 10% Due December 2021 | Convertible debt                  
Subsidiary, Sale of Stock [Line Items]                  
Repayments of convertible debt   $ 70,000              
Debt face amount     $ 249,300   $ 249,300        
Debt instrument, unamortized premium     $ 14,100   $ 14,100        
Convertible Promissory Notes Interest Rate 5% Due December 2020, Recourse | Convertible promissory notes                  
Subsidiary, Sale of Stock [Line Items]                  
Current portion of debt             $ 36,482    
Interest rate percentage     5.00%   5.00%   5.00% 10.00% 5.00%
Convertible stock price (in dollars per share) | $ / shares               $ 8.00 $ 38.64
Convertible Promissory Notes Interest Rate 5% Due December 2020, Recourse | Convertible promissory notes | Affiliated entity                  
Subsidiary, Sale of Stock [Line Items]                  
Convertible stock price (in dollars per share) | $ / shares               $ 38.64  
Term Loan due November 2020, Recourse | Term loan                  
Subsidiary, Sale of Stock [Line Items]                  
Current portion of debt     $ 697   $ 697   $ 1,536    
Interest rate percentage     4.00%   4.00%   4.00%    
Weighted average interest rate (as a percentage)     4.50%   4.50%   6.30%    
Class A common stock                  
Subsidiary, Sale of Stock [Line Items]                  
Common stock, authorized (in shares) | shares     600,000,000   600,000,000   600,000,000    
Class B common stock                  
Subsidiary, Sale of Stock [Line Items]                  
Common stock, authorized (in shares) | shares     600,000,000   600,000,000   600,000,000