XML 66 R42.htm IDEA: XBRL DOCUMENT v3.20.4
Nature of Business, Liquidity, Basis of Presentation - (Additional Information) (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Jun. 18, 2020
USD ($)
shares
May 01, 2020
USD ($)
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Aug. 31, 2020
USD ($)
Mar. 31, 2020
USD ($)
$ / shares
Mar. 30, 2020
Nov. 30, 2019
$ / shares
Subsidiary, Sale of Stock [Line Items]                  
Current portion of debt     $ 120,846 $ 337,583          
Long-term Debt     390,899 636,812          
Comprehensive loss     (186,006) (329,537) $ (289,152)        
Long-term Debt, Gross     $ 527,054 658,083          
Revision of Prior Period, Adjustment [Member]                  
Subsidiary, Sale of Stock [Line Items]                  
Comprehensive loss       $ 5,800 $ 1,800        
Sales Revenue, Net | Customer Concentration Risk | Duke Energy                  
Subsidiary, Sale of Stock [Line Items]                  
Concentration risk, percentage     28.00%            
Sales Revenue, Net | Customer Concentration Risk | SK Engineering & Construction Co., Ltd.                  
Subsidiary, Sale of Stock [Line Items]                  
Concentration risk, percentage     34.00% 23.00%          
Sales Revenue, Net | Customer Concentration Risk | The Southern Company                  
Subsidiary, Sale of Stock [Line Items]                  
Concentration risk, percentage       34.00% 51.00%        
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 | SK Engineering & Construction Co., Ltd.                  
Subsidiary, Sale of Stock [Line Items]                  
Concentration risk, percentage     56.00%            
Asia Pacific | Sales Revenue, Net | Geographic Concentration Risk                  
Subsidiary, Sale of Stock [Line Items]                  
Concentration risk, percentage     35.00% 23.00% 14.00%        
Convertible Promissory Notes Interest Rate 6% Due December 2020, Recourse, Amendment | Convertible promissory notes                  
Subsidiary, Sale of Stock [Line Items]                  
Convertible, number of equity instruments (in shares) | shares 4,700,000                
Debt instrument, unamortized premium $ 3,400                
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    
Converted instrument, amount     $ 252,797 $ 0 $ 0        
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 | Class B common stock | Convertible promissory notes                  
Subsidiary, Sale of Stock [Line Items]                  
Conversion of notes (in shares) | shares     19,100,000            
Additional Convertible Notes | Convertible debt                  
Subsidiary, Sale of Stock [Line Items]                  
Debt face amount             $ 30,000    
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%  
Long-term Debt       $ 36,482          
Long-term Debt, Gross       $ 33,104          
2.5% Green Convertible Senior Notes due August 2025 | Senior secured notes                  
Subsidiary, Sale of Stock [Line Items]                  
Current portion of debt     $ 0            
Interest rate percentage     2.50% 2.50%   2.50%      
Long-term Debt     $ 99,394            
Long-term Debt, Gross     $ 230,000     $ 230,000      
Convertible Promissory Notes Interest Rate 6% Due December 2020, Recourse | Convertible promissory notes                  
Subsidiary, Sale of Stock [Line Items]                  
Current portion of debt       $ 273,410          
Interest rate percentage     10.00% 6.00%          
Long-term Debt       $ 273,410          
Convertible stock price (in dollars per share) | $ / shares                 $ 11.25
Long-term Debt, Gross       $ 289,299          
Convertible Promissory Notes Interest Rate 6% Due December 2020, Recourse | Convertible debt                  
Subsidiary, Sale of Stock [Line Items]                  
Long-term Debt             279,000    
Repayments of convertible debt   70,000              
Debt face amount             $ 289,300    
Debt instrument, unamortized premium   $ 4,300