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CONTRACT BALANCES | 12 Months Ended
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Dec. 31, 2020
CONTRACT BALANCES |
CONTRACT BALANCES | 4 CONTRACT BALANCES Accounts Receivable, Net Accounts receivable, net consisted of the following: ​
​ | ​ | ​ | ​ | ​
​ | ​ | As of December 31,
​ |  | 2019 |  | 2020
​ | ​ | ​ | ​ | ​
Accounts receivable |  | 881,177 |  | 1,482,498
Less: allowance for doubtful accounts |  | (133) |  | (2,163)
Accounts receivable, net |  | 881,044 |  | 1,480,335
​ | ​ | ​ | ​ | ​
Including: | ​ | ​ | ​ | ​
- Current portion | ​ | 879,962 | ​ | 1,480,335
- Non-current portion | ​ | 1,082 | ​ | —
​ As of December 31, 2019 and 2020, the accounts receivable expected to be received after one year amounted to RMB1,082 and nil were recorded in other non-current assets in the consolidated balance sheet, respectively. Accounts receivable of RMB520,382 and RMB819,578 was pledged as security for bank loans (Note 9) as of December 31, 2019 and 2020, respectively. Accounts receivable of RMB128,353 was pledged as security for finance lease and other financing obligations (Note 12) as of December 31, 2020. The following table presents the movement of the allowance for doubtful accounts: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years ended December 31,
​ |  | 2018 |  | 2019 |  | 2020
​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at the beginning of the year |  | — |  | 241 | ​ | 133
Allowance made during the year |  | 241 |  | 274 | ​ | 2,032
Write-off during the year | ​ | — | ​ | (382) | ​ | —
Foreign exchange impact | ​ | — | ​ | — | ​ | (2)
Balance at the end of the year |  | 241 |  | 133 | ​ | 2,163
​ During the years ended December 31, 2018, 2019 and 2020, the Company made an allowance on accounts receivable of RMB241, RMB274 and RMB2,032, respectively. Deferred Revenue The opening and closing balances of the Company’s deferred revenue are as following: ​
​ | ​ | ​
​ |  | Deferred revenue
​ | ​ | ​
Beginning balance as of January 1, 2020 |  | 105,735
Increase |  | 5,804
​ | ​ | ​
Closing balance as of December 31, 2020 |  | 111,539
​ The difference between the opening and closing balances of the Company’s deferred revenue primarily results from the timing difference between the satisfaction of the Company’s performance obligation and the customer’s payment. As of December 31, 2019 and 2020, the deferred revenue expected to be recognized as revenue after one year amounted to RMB15,419 and RMB14,871, respectively, were recorded in other long-term liabilities in the consolidated balance sheet. The amounts of revenue recognized during the years ended December 31, 2018, 2019 and 2020 from the opening deferred revenue balance was RMB43,192, RMB66,500 and RMB96,084, respectively. Remaining performance obligations The Company elected to apply the practical expedient that allows the Company not to disclose the remaining performance obligations for variable considerations. This includes usage-based contracts for certain colocation and managed hosting services. As of December 31, 2020, approximately RMB 2,261,990 of total revenues and deferred revenues, excluding any variable considerations, are expected to be recognized in future periods, the majority of which will be recognized over the next four years.

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