v3.26.1
Debt - Narrative (Details)
6 Months Ended
Jun. 30, 2026
USD ($)
Jan. 09, 2026
USD ($)
Jul. 30, 2025
USD ($)
Aug. 30, 2024
USD ($)
Jun. 30, 2026
USD ($)
Jun. 30, 2025
USD ($)
Dec. 31, 2025
USD ($)
Oct. 23, 2025
USD ($)
Aug. 14, 2025
USD ($)
Jul. 27, 2022
USD ($)
Debt Instrument [Line Items]                    
Repayment of short-term financings         $ 0 $ 25,000,000        
Total long-term debt and finance leases $ 72,649,000       72,649,000   $ 96,617,000      
Accrued unpaid interest 200,000       200,000   300,000      
MTL Manufacturing & Equipment, Inc.                    
Debt Instrument [Line Items]                    
Purchase price   $ 11,100,000                
Revolving Credit Agreement                    
Debt Instrument [Line Items]                    
Long-term debt 65,000,000       65,000,000   95,000,000      
Previous Shareholder Loan Agreements, Weichai | Subordinated Debt                    
Debt Instrument [Line Items]                    
Payment for debt extinguishment or debt prepayment cost       $ 60,000,000.0            
Short-term financing       $ 25,000,000.0            
Promissory Note | Subordinated Debt                    
Debt Instrument [Line Items]                    
Basis spread on variable rate (as percent)       4.05%            
Debt instrument, face amount       $ 105,000,000.0            
Debt instrument, incremental borrowing cost (as percent)       1.00%            
Debt instrument, amount not subject to subordination       $ 10,000,000.0            
Promissory Note                    
Debt Instrument [Line Items]                    
Long-term debt 1,125,000       1,125,000          
Promissory Note | Secured Debt                    
Debt Instrument [Line Items]                    
Debt instrument, interest rate   8.00%                
Long-term debt 1,125,000       1,125,000   0      
Promissory Note | Secured Debt | MTL Manufacturing & Equipment, Inc.                    
Debt Instrument [Line Items]                    
Debt instrument, face amount   $ 1,100,000                
First Master Loan Agreement                    
Debt Instrument [Line Items]                    
Long-term debt 3,057,000       3,057,000          
First Master Loan Agreement | Secured Debt                    
Debt Instrument [Line Items]                    
Debt instrument, face amount                 $ 3,500,000  
Debt instrument, interest rate                 6.25%  
Long-term debt 3,057,000       3,057,000   0      
Second Master Loan Agreement                    
Debt Instrument [Line Items]                    
Long-term debt 1,831,000       1,831,000          
Second Master Loan Agreement | Secured Debt                    
Debt Instrument [Line Items]                    
Debt instrument, face amount               $ 2,000,000.0    
Debt instrument, interest rate               6.20%    
Long-term debt 1,831,000       1,831,000   0      
SBA Loan | Secured Debt                    
Debt Instrument [Line Items]                    
Debt instrument, face amount                   $ 900,000
Debt instrument, interest rate                   5.03%
Long-term debt 0       0   0      
Prepayment percentage threshold                   20.00%
Repayments of long-term debt 600,000                  
Revolving Credit Facility | Revolving Credit Agreement | Line of Credit                    
Debt Instrument [Line Items]                    
Maximum borrowing capacity     $ 135,000,000.0              
Basis spread on variable rate (as percent)     2.10%              
Debt issuance costs     $ 1,200,000              
Revolving line of credit, long-term 65,000,000.0       65,000,000.0          
Long-term debt $ 65,000,000       $ 65,000,000   $ 95,000,000      
Revolving Credit Facility | Revolving Credit Agreement | Line of Credit                    
Debt Instrument [Line Items]                    
Maximum borrowing capacity       $ 120,000,000.0            
Basis spread on variable rate (as percent)       2.00%            
Debt issuance costs       $ 600,000            
Proceeds from short-term financings       100,000,000.0            
Majority shareholder ownership threshold for variable rate increase (as percent)     0.50              
Revolving Credit Facility | Revolving Credit Agreement - In Event Majority Shareholder Holds Less Than 50% Of Equity | Line of Credit                    
Debt Instrument [Line Items]                    
Basis spread on variable rate (as percent)     2.60%              
Revolving Credit Facility | Fourth Amended And Restated Credit Agreement | Line of Credit                    
Debt Instrument [Line Items]                    
Repayment of short-term financings       $ 40,000,000.0