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Acquisitions - Narratives (Details)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 22, 2020
USD ($)
item
Jun. 30, 2021
USD ($)
Apr. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Jun. 18, 2020
Earn-out payments       $ 1,100 $ 1,100  
Deferred tax liability       6,100 6,100  
Reduction to valuation allowance         5,200  
Unrecognized tax benefits released due to expiration of stature of limitations       5,200 5,200  
Income tax benefit       17,659 17,659  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities       6,100 6,100  
Business Combination, Contingent Consideration, Liability       1,100 1,100  
Income Tax Expense (Benefit)       (17,659) (17,659)  
Forecast            
Payment for Contingent Consideration Liability, Financing Activities   $ 1,500        
Giner ELX, Inc            
Percentage of outstanding shares 100.00%          
Earn-out payments $ 16,000          
Achievement of Allagah earn out 8,000          
Receipt of certain customer opportunities 2,000          
Achievement of revenue targets $ 6,000          
Number of electrolyzer stacks | item 2          
Warrants term 2 years          
Business Combination, Contingent Consideration, Liability $ 16,000          
Giner ELX, Inc | Non achieving of allagash earn out revenue by July 31, 2033            
Percentage of monthly reduction of contingent consideration 8.33%          
Giner ELX, Inc | Earn-out revenue exceeds 150% of target stated for year 2023            
Warrants $ 5,000          
Giner ELX, Inc | Earn-out revenue exceeds 200% of target stated for year 2023            
Warrants $ 10,000          
United Hydrogen Group Inc            
Cash paid in respect to certain indebtedness     $ 1,300      
Percentage of outstanding shares           100.00%
United Hydrogen Group Inc | Common Stock            
Value of shares of common stock issued     $ 6,500      
Developed Technology Rights            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets       2,300 2,300  
In process R&D            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets       29,000 29,000  
Customer relationships            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets       $ 300 $ 300