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Land Use Rights, Net (Tables) | 12 Months Ended
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Dec. 31, 2017
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Land Use Rights | Land use rights held by the Company are amortized over the remaining term of the respective land use rights certificates.
|  | December 31, |
|  | 2016 |  |  | 2017 |
|  | RMB |  |  | RMB |  |  | US$ |
Cost |  |  | 172,658 |  |  |  | 172,520 |  |  |  | 26,516 |
Accumulated amortization |  |  | (5,012 | ) |  |  | (8,849 | ) |  |  | (1,360 | )
Land use rights, net |  |  | 167,646 |  |  |  | 163,671 |  |  |  | 25,156 |
Carrying Value of Land Use Rights Pledged by Company to Secure Banking Borrowings | The carrying amounts of land use rights pledged by the Company to secure banking borrowings (Note 13) granted to the Company at the respective balance sheet dates were as follows:
|  | December 31, |
|  | 2016 |  |  | 2017 |
|  | RMB |  |  | RMB |  |  | US$ |
Land use rights |  |  | 17,232 |  |  |  | 16,818 |  |  |  | 2,585 |

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