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Cash and Cash Equivalents (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Cash and Cash Equivalents [Line Items]    
Cash and cash equivalents $ 49,565 $ 53,207
United States    
Cash and Cash Equivalents [Line Items]    
Cash and cash equivalents 6,996 1,156
People's Republic of China (PRC)    
Cash and Cash Equivalents [Line Items]    
Cash and cash equivalents 12,967 20,885
Asia (excluding the PRC)    
Cash and Cash Equivalents [Line Items]    
Cash and cash equivalents 10,264 2,398
Europe    
Cash and Cash Equivalents [Line Items]    
Cash and cash equivalents 9,166 19,907
South America    
Cash and Cash Equivalents [Line Items]    
Cash and cash equivalents $ 10,172 $ 8,861