Long-lived Tangible Assets - Long-Lived Tangible Assets by Geographic Area (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Long-lived Assets from External Customers and Long-Lived Assets [Line Items]
Total long-lived tangible assets	$ 96,925	$ 106,807
Accumulated depreciation	164,500	154,200
United States
Long-lived Assets from External Customers and Long-Lived Assets [Line Items]
Total long-lived tangible assets	14,561	15,411
People's Republic of China
Long-lived Assets from External Customers and Long-Lived Assets [Line Items]
Total long-lived tangible assets	58,027	64,197
Mexico
Long-lived Assets from External Customers and Long-Lived Assets [Line Items]
Total long-lived tangible assets	20,788	22,410
All other countries
Long-lived Assets from External Customers and Long-Lived Assets [Line Items]
Total long-lived tangible assets	$ 3,549	$ 4,789