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INTANGIBLE ASSETS, NET (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2020
INTANGIBLE ASSETS, NET |
Schedule of intangible assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | As of December 31,
​ |  | Note |  | 2019 |  | 2020
​ | ​ | ​ | ​ | ​ | ​ | ​
Customer relationships | ​ | 8 | ​ | 547,322 |  | 952,100
Licenses | ​ | ​ | ​ | 6,000 | ​ | 15,782
​ | ​ | ​ | ​ | 553,322 |  | 967,882
Less: accumulated amortization | ​ | ​ | ​ | (158,694) |  | (182,560)
Intangible assets, net | ​ | ​ | ​ | 394,628 |  | 785,322
​
Schedule of estimated future amortization expense | ​
​ | ​ | ​
Fiscal year ending December 31, |  |
2021 |  | 114,844
2022 |  | 114,844
2023 |  | 113,302
2024 |  | 106,443
2025 | ​ | 92,131
Thereafter |  | 243,758
Total |  | 785,322

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