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Financial Instruments - Financial liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Measured at amortized cost:      
Short-term unsecured borrowings $ 0 $ 57,339  
Short-term secured borrowings 104,000 164,000  
Accounts payables and other payables (including related parties) 222,739 154,175  
Long-term unsecured borrowings (including current portion) 58,500 0  
Lease liabilities 10,454 4,220  
Guarantee deposits 5,765 400  
Total 401,458 380,134  
Unsecured Borrowings      
Measured at amortized cost:      
Short-term unsecured borrowings 0 57,339 $ 20,000
Secured Borrowings      
Measured at amortized cost:      
Short-term secured borrowings $ 104,000 $ 164,000 $ 164,000