Major Customers (Details) $ in Thousands	3 Months Ended												12 Months Ended
Major Customers (Details) $ in Thousands	Dec. 31, 2025 USD ($)	Sep. 30, 2025 USD ($)	Jun. 30, 2025 USD ($)	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Sep. 30, 2024 USD ($)	Jun. 30, 2024 USD ($)	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Sep. 30, 2023 USD ($)	Jun. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2025 USD ($) customer	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Revenue, Major Customer [Line Items]
Number of major customers \| customer													5
Net sales	$ 74,677	$ 58,435	$ 79,239	$ 61,447	$ 62,498	$ 72,992	$ 88,743	$ 78,145	$ 73,778	$ 86,728	$ 97,725	$ 99,507	$ 273,798	$ 302,378	$ 357,738
Product sales
Revenue, Major Customer [Line Items]
Net sales	55,382	54,178	61,633	61,012	60,047	71,258	83,956	75,831	72,439	80,896	95,703	98,337	232,205	291,092	347,375
Tooling sales
Revenue, Major Customer [Line Items]
Net sales	$ 19,295	$ 4,257	$ 17,606	$ 435	$ 2,451	$ 1,734	$ 4,787	$ 2,314	$ 1,339	$ 5,832	$ 2,022	$ 1,170	41,593	11,286	10,363
BRP
Revenue, Major Customer [Line Items]
Net sales													38,799	29,887	48,702
BRP \| Product sales
Revenue, Major Customer [Line Items]
Net sales													34,393	28,523	43,924
BRP \| Tooling sales
Revenue, Major Customer [Line Items]
Net sales													4,406	1,364	4,778
Navistar
Revenue, Major Customer [Line Items]
Net sales													76,945	66,537	72,118
Navistar \| Product sales
Revenue, Major Customer [Line Items]
Net sales													43,869	65,084	71,367
Navistar \| Tooling sales
Revenue, Major Customer [Line Items]
Net sales													33,076	1,453	751
PACCAR
Revenue, Major Customer [Line Items]
Net sales													29,876	39,116	37,363
PACCAR \| Product sales
Revenue, Major Customer [Line Items]
Net sales													29,554	38,507	35,745
PACCAR \| Tooling sales
Revenue, Major Customer [Line Items]
Net sales													322	609	1,618
UFP
Revenue, Major Customer [Line Items]
Net sales													22,310	31,679	32,030
UFP \| Product sales
Revenue, Major Customer [Line Items]
Net sales													22,310	31,679	32,030
UFP \| Tooling sales
Revenue, Major Customer [Line Items]
Net sales													0	0	0
Volvo
Revenue, Major Customer [Line Items]
Net sales													10,155	41,007	58,198
Volvo \| Product sales
Revenue, Major Customer [Line Items]
Net sales													10,155	41,007	57,168
Volvo \| Tooling sales
Revenue, Major Customer [Line Items]
Net sales													0	0	1,030
Other
Revenue, Major Customer [Line Items]
Net sales													95,713	94,152	109,327
Other \| Product sales
Revenue, Major Customer [Line Items]
Net sales													91,924	86,292	107,141
Other \| Tooling sales
Revenue, Major Customer [Line Items]
Net sales													$ 3,789	$ 7,860	$ 2,186