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v3.21.1

CONTRACT BALANCES (Details) - CNY (¥) ¥ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accounts receivable, net |  |  |
Accounts receivable | ¥ 1,482,498 | ¥ 881,177 |
Less: allowance for doubtful accounts | (2,163) | (133) | ¥ (241)
Accounts receivable, net | 1,480,335 | 881,044 |
- Current portion | 1,480,335 | 879,962 |
- Non-current portion | 0 | 1,082 |
Movement of the allowance for doubtful accounts |  |  |
Allowance made during the year | 2,032 | 274 | 241
Write-off during the year |  | (382) |
Foreign exchange impact | (2) |  |
Deferred Revenue |  |  |
Beginning balance | 105,735 |  |
Increase | 5,804 |  |
Closing balance | 111,539 | 105,735 |
Deferred revenue expected to be recognized as revenue after one year | 14,871 | 15,419 |
Revenue recognized from the opening deferred revenue balance | 96,084 | 66,500 | ¥ 43,192
Accounts receivable | Bank loans |  |  |
Accounts receivable, net |  |  |
Assets pledged | 819,578 | ¥ 520,382 |
Accounts receivable | Finance lease and other financing obligations |  |  |
Accounts receivable, net |  |  |
Assets pledged | ¥ 128,353 |  |

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