Business Segment Information - Summary of Property, Plant and Equipment of Reporting Segments by Geographic Area (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment net	$ 63,613	$ 62,727
U.S. [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment net	47,646	51,278
Italy [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment net	10,503	7,937
Germany [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment net	2,516	849
United Kingdom [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment net	1,540	1,082
Brazil [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment net	163	141
Others [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment net	$ 1,245	$ 1,440