Summary of Significant Accounting Policies and Other Information - Narrative (Details)	12 Months Ended
	Dec. 31, 2025 USD ($) boardMember	Dec. 31, 2024 USD ($)	Jul. 30, 2025 USD ($)	Aug. 30, 2024 USD ($)
Concentration Risk [Line Items]
Number of board members | boardMember	4
Net income	$ 113,987,000	$ 69,279,000
Cash flow from operating activities	24,113,000	62,390,000
Restricted cash	3,698,000	3,239,000
Inventory raw materials provided by customers	200,000	800,000
Goodwill, impairment charges	0	0
Impairment losses of long-lived asset, held-for-use	0	0
Product warranty reimbursements	$ 200,000	200,000
Power Solutions International, Inc. | Weichai America Corp
Concentration Risk [Line Items]
Equity method investment, ownership percentage	46.00%
Revolving Credit Facility | Revolving Credit Agreement | Line of Credit
Concentration Risk [Line Items]
Maximum borrowing capacity			$ 135,000,000.0	$ 120,000,000.0
Minimum
Concentration Risk [Line Items]
Amortization period (in years)	3 years
Maximum
Concentration Risk [Line Items]
Amortization period (in years)	15 years
Contract With Customer
Concentration Risk [Line Items]
Restricted cash	$ 1,400,000	$ 1,400,000