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SIGNIFICANT ACCOUNTING POLICIES - Capital Advance receivable, net - current and overdue amounts (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | --- | ---
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total | $ 73,625 | $ 67,682 | $ 33,490 | $ 60,636 | $ 16,909
Current | 72,024 | 66,018 |  | 58,468 |
1-30 days overdue |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total | 15,202 | 10,143 |  | 10,857 |
Overdue | 404 | 263 |  | 1,373 |
30-60 overdue |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total | 23,963 | 19,726 |  | 16,016 |
Overdue | 113 | 129 |  | 619 |
60-90 overdue |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total | 28,957 | 34,979 |  | 31,595 |
Overdue | 204 | 218 |  | 96 |
Above 90 overdue |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total | 3,902 | 1,170 |  |  |
Overdue | $ 880 | $ 1,054 |  | $ 80 |

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