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Prepaid Expenses and Other Current Assets | 12 Months Ended
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Dec. 31, 2013
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Prepaid Expenses and Other Current Assets | 7. Prepaid expenses and other current assets Prepaid expenses and other current assets consist of the following:
|  | As of December 31, |
|  | 2012 |  |  | 2013 |
Prepaid concession approval fees |  | $ | 79 |  |  | $ | 6 |
Prepaid for procurement of advertising equipment |  |  | 51 |  |  |  | 65 |
Prepaid for rent of advertising spaces |  |  | — |  |  |  | 207 |
Rental deposits and other receivables |  |  | 143 |  |  |  | 521 |
Total prepaid expenses and other current assets |  | $ | 273 |  |  | $ | 799 |

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