Long-lived Tangible Assets - Long-Lived Tangible Assets by Geographic Area (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Long-lived Assets from External Customers and Long-Lived Assets [Line Items]
Total long-lived tangible assets	$ 102,571	$ 106,807
Accumulated depreciation	157,300	154,200
United States
Long-lived Assets from External Customers and Long-Lived Assets [Line Items]
Total long-lived tangible assets	14,337	15,411
People's Republic of China
Long-lived Assets from External Customers and Long-Lived Assets [Line Items]
Total long-lived tangible assets	62,191	64,197
Mexico
Long-lived Assets from External Customers and Long-Lived Assets [Line Items]
Total long-lived tangible assets	22,248	22,410
All other countries
Long-lived Assets from External Customers and Long-Lived Assets [Line Items]
Total long-lived tangible assets	$ 3,795	$ 4,789