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Property, Plant and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025	Dec. 31, 2025
Property, Plant, and Equipment [Line Items]
Total property, plant and equipment, gross	$ 48,409		$ 48,409		$ 45,424
Less: accumulated depreciation and amortization	(32,531)		(32,531)		(29,662)
Property, plant and equipment, net	15,878		15,878		15,762
Total depreciation	884	$ 860	2,622	$ 2,724
Location, Statement of Income, Balance [Axis]: acnt:SellingGeneralAndAdministrativeExpenseAndDepreciationDepletionAndAmortization
Property, Plant, and Equipment [Line Items]
Total depreciation	83	71	250	181
Location, Statement of Income, Balance [Axis]: us-gaap:CostOfGoodsAndServicesSold
Property, Plant, and Equipment [Line Items]
Total depreciation	801	$ 789	2,372	$ 2,543
Land
Property, Plant, and Equipment [Line Items]
Total property, plant and equipment, gross	518		518		518
Leasehold improvements
Property, Plant, and Equipment [Line Items]
Total property, plant and equipment, gross	2,825		2,825		2,624
Buildings
Property, Plant, and Equipment [Line Items]
Total property, plant and equipment, gross	1,830		1,830		1,830
Machinery, fixtures and equipment
Property, Plant, and Equipment [Line Items]
Total property, plant and equipment, gross	41,612		41,612		40,120
Construction-in-progress
Property, Plant, and Equipment [Line Items]
Total property, plant and equipment, gross	$ 1,624		$ 1,624		$ 332