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Prepayments and other current assets - Schedule of Prepayments and Other Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Current portion:    
Advance to suppliers $ 3,579 $ 3,021
Interest-free loans to employees 3,185 3,616
Rental and other deposits 1,990 2,604
Advance to employees for business purposes 211 180
Interest receivable 4  
Prepaid management insurance 249 192
Receivable related to Linktoken disposal 3,536  
Proceed receivable 1,105  
Prepayment for taxation 936 69
Others 1,748 554
Total of prepayments and other current assets 16,543 10,236
Non-current portion:    
Low-interest loans to employees, non-current portion 313 593
Total of long-term prepayments and other assets $ 313 $ 593