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Prepayments and other assets - Schedule of Prepayments and Other Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Current portion:    
Deposit related to an ongoing litigation (note a) $ 4,862 $ 4,751
Advance to suppliers (note b) 2,088 1,997
Loans to employees (note c) 1,614 1,896
Rental and other deposits 1,159 1,670
Others 2,119 1,220
Total of prepayments and other current assets 11,842 11,534
Non-current portion:    
Loans to employees, non-current portion (note c) 1,473 905
Advances to suppliers, non-current portion (note b) 1,314  
Total of long-term prepayments and other assets $ 2,787 $ 905