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ACCOUNTS RECEIVABLES, NET | 9 Months Ended
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Sep. 30, 2017
ACCOUNTS RECEIVABLES, NET |
ACCOUNTS RECEIVABLES, NET | 4 ACCOUNTS RECEIVABLES, NET Accounts receivables, net consisted of the following:
|  | As of December 31, 2016 |  | As of September 30, 2017 |
Accounts receivables |  |  | 198,851 |  |  | 306,308 |
Less: allowance for doubtful accounts |  |  | — |  |  | — |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Accounts receivables, net |  |  | 198,851 |  |  | 306,308 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
The Company generally invoices its customers on a monthly or quarterly basis in accordance with the contract terms. Due to the timing difference between the billing and revenue recognition, accounts receivables included an unbilled portion of RMB117,192 and RMB212,472 as of December 31, 2016 and September 30, 2017, respectively.

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