Cash and Cash Equivalents (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 55,363	$ 57,153
North America
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	5,618	9,812
People's Republic of China
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	13,941	14,244
Asia (excluding PRC)
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	12,451	13,518
Europe
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	15,319	10,926
South America
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 8,034	$ 8,653