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Debt - Narrative (Details)
 3 Months Ended 6 Months Ended
May 12, 2023
USD ($)
Mar. 24, 2023
USD ($)
agreement
Jun. 30, 2023
USD ($)
Jun. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
Jun. 30, 2022
USD ($)
Debt Instrument [Line Items]            
Number of amended agreements | agreement   2        
Number of agreements | agreement   4        
Short-term financing     $ 189,820,000 $ 189,820,000 $ 205,614,000  
Debt, long-term and short-term, combined amount     190,300,000 190,300,000 211,000,000  
Cash and cash equivalents     27,782,000 27,782,000 24,296,000 $ 3,448,000
Accrued unpaid interest     6,700,000 6,700,000 5,300,000  
Revolving credit facility            
Debt Instrument [Line Items]            
Debt issuance costs     700,000 700,000 400,000  
First Shareholder's Loan Agreement, Weichai | Revolving credit facility            
Debt Instrument [Line Items]            
Short-term financing     0 0    
Third Amended And Restated Credit Agreement | Revolving credit facility            
Debt Instrument [Line Items]            
Short-term financing     110,000,000 $ 110,000,000 $ 130,000,000  
Third Amended And Restated Credit Agreement | Revolving credit facility | SOFR            
Debt Instrument [Line Items]            
Basis spread on variable rate   3.35%        
Fourth Shareholder's Loan Agreement, Weichai | Revolving credit facility            
Debt Instrument [Line Items]            
Short-term financing   $ 30,000,000.0        
Second, Third, And Fourth Shareholder's Loan Agreement, Weichai            
Debt Instrument [Line Items]            
Debt instrument, incremental borrowing cost       1.00%    
Second Shareholder's Loan Agreement, Weichai | SOFR            
Debt Instrument [Line Items]            
Basis spread on variable rate 4.05%          
Revolving credit facility | First Shareholder's Loan Agreement, Weichai            
Debt Instrument [Line Items]            
Maximum borrowing capacity   130,000,000.0 110,000,000.0 $ 110,000,000.0    
Paydown related to credit agreement     20,000,000.0      
Revolving credit facility | Second Standard Chartered Bank Credit Agreement            
Debt Instrument [Line Items]            
Debt issuance costs   $ 1,000,000.0        
Revolving credit facility | Fourth Shareholder's Loan Agreement, Weichai            
Debt Instrument [Line Items]            
Maximum borrowing capacity     30,000,000 $ 30,000,000    
Revolving credit facility | Fourth Shareholder's Loan Agreement, Weichai | SOFR            
Debt Instrument [Line Items]            
Basis spread on variable rate       4.05%    
Revolving credit facility | Second Shareholder's Loan Agreement, Weichai            
Debt Instrument [Line Items]            
Maximum borrowing capacity $ 25,000,000   50,000,000 $ 50,000,000    
Revolving credit facility | Second Shareholder's Loan Agreement, Weichai | SOFR            
Debt Instrument [Line Items]            
Basis spread on variable rate       4.65%    
Revolving credit facility | Third Shareholder's Loan Agreement, Weichai            
Debt Instrument [Line Items]            
Maximum borrowing capacity     $ 50,000,000 $ 50,000,000    
Revolving credit facility | Third Shareholder's Loan Agreement, Weichai | SOFR            
Debt Instrument [Line Items]            
Basis spread on variable rate       4.65%