Cash and Cash Equivalents (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 58,825	$ 57,153
North America
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	7,663	9,812
People's Republic of China
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	14,573	14,244
Asia (excluding PRC)
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	11,904	13,518
Europe
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	15,194	10,926
South America
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 9,491	$ 8,653