Summary of Long-lived Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Long-Lived Assets by Geographical Areas [Line Items]
Property, plant and equipment, net	$ 78,676	$ 77,556
United States
Long-Lived Assets by Geographical Areas [Line Items]
Property, plant and equipment, net	25,436	28,750
GERMANY
Long-Lived Assets by Geographical Areas [Line Items]
Property, plant and equipment, net	36,314	32,376
Rest Of Europe
Long-Lived Assets by Geographical Areas [Line Items]
Property, plant and equipment, net	14,759	14,303
China
Long-Lived Assets by Geographical Areas [Line Items]
Property, plant and equipment, net	1,809	2,029
Rest of Asia-Pacific
Long-Lived Assets by Geographical Areas [Line Items]
Property, plant and equipment, net	$ 358	$ 98