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Accounts Receivable, Net | 12 Months Ended
--- | ---
Dec. 31, 2017
Accounts Receivable, Net |
5. | ACCOUNTS RECEIVABLE, NET
|  | As of December 31, |
|  | 2016 |  |  | 2017 |
|  | RMB |  |  | RMB |  |  | US$ |
Accounts receivable |  |  | 672,872 |  |  |  | 693,387 |  |  |  | 106,572 |
Allowance for doubtful accounts |  |  | (71,987 | ) |  |  | (72,115 | ) |  |  | (11,084 | )
|  |  | 600,885 |  |  |  | 621,272 |  |  |  | 95,488 |
As of December 31, 2016 and 2017, all accounts receivable were due from third party customers. Provision for doubtful accounts for the years ended December 31, 2015, 2016 and 2017 were RMB13,641, RMB42,533 and RMB11,688 (US$1,796), respectively.

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