v3.26.1
Summary of Significant Accounting Policies and Other Information - Narrative (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2026
USD ($)
segment
boardMember
Dec. 31, 2025
USD ($)
Mar. 31, 2025
USD ($)
Concentration Risk [Line Items]      
Number of board members | boardMember 4    
Number of operating segments | segment 1    
Restricted cash $ 4,448 $ 3,698 $ 3,638
Inventory raw materials provided by customers 100 200  
Contract With Customer      
Concentration Risk [Line Items]      
Restricted cash $ 1,400 $ 1,400  
Founders | Power Solutions International, Inc. | Minimum      
Concentration Risk [Line Items]      
Subsidiary, ownership percentage, noncontrolling owner 5.00%    
Founders | Power Solutions International, Inc. | Maximum      
Concentration Risk [Line Items]      
Subsidiary, ownership percentage, noncontrolling owner 10.00%    
Power Solutions International, Inc. | Weichai America Corp      
Concentration Risk [Line Items]      
Equity method investment, ownership percentage 46.00%