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Prepayments and other current assets - Schedule of Prepayments and Other Assets (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Current portion: |  |
Advance to suppliers (note a) | $ 1,483,000 | $ 3,579,000
Receivable related to Linktoken disposal (note b) |  | 3,536,000
Interest-free loans to employees (note c) | 1,896,000 | 3,185,000
Rental and other deposits | 1,670,000 | 1,990,000
Proceed receivable | 137,000 | 1,105,000
Prepayment for taxation | 112,000 | 936,000
Prepaid management insurance | 241,000 | 249,000
Advance to employees for business purposes | 86,000 | 211,000
Interest receivable | 2,000 | 4,000
Deposit related to an ongoing litigation | 4,751,000 |
Others | 1,156,000 | 1,748,000
Total of prepayments and other current assets | 11,534,000 | 16,543,000
Non-current portion: |  |
Low-interest loans to employees, non-current portion (note c) | 905,000 | 313,000
Total of long-term prepayments and other assets | 905,000 | $ 313,000
Impairment provision recognised | $ 3,536,000 |

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