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Acquisitions - Narratives (Details)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 22, 2020
USD ($)
item
Jun. 18, 2020
USD ($)
Apr. 30, 2020
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Warrants               $ 98 $ 525 $ 2,231
Increase in goodwill             $ 62,600      
Change in fair value       $ 1,130 $ 1,130 $ 1,160        
Deferred tax liability           5,900        
Reduction to valuation allowance           5,200        
Unrecognized tax benefits released due to expiration of stature of limitations           5,200        
Giner ELX, Inc                    
Percentage of outstanding shares 100.00%                  
Earn-out payments $ 16,000         7,800        
Achievement of Allagash 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                  
Increase in other liabilities           700        
Increase in goodwill           700        
Fair value contingent estimated           9,600        
Change in fair value           1,800        
Deferred tax liability $ 5,889                  
Revenues           3,600        
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                    
Percentage of outstanding shares   100.00%                
Earn-out payments   $ 1,100       200        
Cash paid in respect to certain indebtedness     $ 1,000              
Increase in goodwill   200                
Decrease in long term debt   1,900                
Increase in other liabilities   1,700                
Payment made on achievement of first milestone   300                
Change in fair value of contingent consideration due to reduction in the probability assessment   $ 610                
Revenues           4,200        
United Hydrogen Group Inc | Common Stock                    
Value of shares of common stock issued     $ 6,500              
Developed Technology Rights | United Hydrogen Group Inc                    
Fair value of acquisition           2,300        
In process R&D | Giner ELX, Inc                    
Fair value of acquisition           29,000        
Customer relationships | Giner ELX, Inc                    
Fair value of acquisition           400        
Wet Stack Technology | Giner ELX, Inc                    
Fair value of acquisition           $ 400