Geographic Data - Sales Attributed to Countries Based upon Origin of Sale (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Revenues From External Customers And Long Lived Assets [Line Items]
Long-Lived Assets	$ 97,437	$ 105,038
Geographic Distribution | United States
Revenues From External Customers And Long Lived Assets [Line Items]
Long-Lived Assets	39,368	41,993
Geographic Distribution | China
Revenues From External Customers And Long Lived Assets [Line Items]
Long-Lived Assets	30,240	32,751
Geographic Distribution | Mexico
Revenues From External Customers And Long Lived Assets [Line Items]
Long-Lived Assets	12,441	14,149
Geographic Distribution | Czech Republic
Revenues From External Customers And Long Lived Assets [Line Items]
Long-Lived Assets	9,856	10,946
Geographic Distribution | Taiwan
Revenues From External Customers And Long Lived Assets [Line Items]
Long-Lived Assets	5,071	4,593
Geographic Distribution | Other non-U.S.
Revenues From External Customers And Long Lived Assets [Line Items]
Long-Lived Assets	$ 461	$ 606