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Acquisition - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
May 31, 2022
May 31, 2021
Apr. 09, 2021
Apr. 08, 2021
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Aug. 31, 2019
Business Acquisition [Line Items]                    
Business acquisition, net of cash acquired             $ 0 $ 160    
Loss on pre-existing agreement         $ 0 $ 22,516 0 $ 30,368    
Long-term debt, current portion         1,765   1,765   $ 1,644  
Long-term debt, excluding current portion         $ 3,816   $ 3,816   $ 4,727  
Hi-Power                    
Business Acquisition [Line Items]                    
Initial ownership interest     100.00% 49.00% 49.00%   49.00%     49.00%
Notes Payable | Hi-Power Purchase Agreement                    
Business Acquisition [Line Items]                    
Long-term debt, current portion         $ 4,839   $ 4,839      
Long-term debt, excluding current portion         $ 9,177   $ 9,177      
Hi-Power                    
Business Acquisition [Line Items]                    
Percentage of voting interests acquired     51.00% 51.00% 51.00%   51.00%      
Aggregate purchase price     $ 25,000              
Consideration transferred, liabilities incurred $ 5,000 $ 5,000                
Payment to terminate agreement     724              
Consideration transferred       $ 418            
Fair value of previously held ownership interest       205            
Loss on remeasurement       $ 7,480            
Hi-Power | Holtec Power, Inc.                    
Business Acquisition [Line Items]                    
Aggregate purchase price     35,283              
Business acquisition, net of cash acquired     10,283              
Fair value     33,474              
Payment to terminate agreement     $ 32,750