Cash and Cash Equivalents (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 67,146	$ 74,302
North America
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	14,693	16,751
People's Republic of China
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	15,054	13,700
Asia (excluding PRC)
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	12,291	21,691
Europe
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	16,802	9,081
South America
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 8,306	$ 13,079