Property, Plant and Equipment, net (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property, plant and equipment
Gross	$ 48,352	$ 40,709
Accumulated depreciation	(18,512)	(15,381)
Net	29,840	25,328
Depreciation expense	3,400	2,600	$ 3,200
Land and buildings
Property, plant and equipment
Gross	10,887	7,365
Machinery and equipment
Property, plant and equipment
Gross	30,768	28,732
Construction in process
Property, plant and equipment
Gross	$ 6,697	$ 4,612

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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