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Long-Term Debt (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Jan. 01, 2021
Dec. 31, 2019
Mar. 31, 2019
Long-Term Debt              
Interest rate (as a percent)         3.75%    
Loss on extinguishment of debt $ 13,222   $ 13,222        
Percent of securities in foreign subsidiaries guaranteed to secure debt   65.00%          
Principal payments of long term debt              
December 31, 2021   $ 127,317          
December 31, 2022   93,321          
December 31, 2023   62,920          
December 31, 2024   33,692          
Secured term loan facility | Loan and security agreement              
Long-Term Debt              
Borrowing       $ 100,000      
Interest rate (as a percent)       9.50%   12.00%  
Term Loan facility              
Principal payments of long term debt              
Incremental term loan   150,800          
Term Loan facility | United Hydrogen Group Inc              
Principal payments of long term debt              
Incremental term loan   $ 10,000          
Generate Lending, LLC | Secured term loan facility | Loan and security agreement              
Long-Term Debt              
Loan Amount             $ 100,000