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PREPAID EXPENSES AND OTHER CURRENT ASSETS | 12 Months Ended
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Dec. 31, 2014
PREPAID EXPENSES AND OTHER CURRENT ASSETS |
PREPAID EXPENSES AND OTHER CURRENT ASSETS | 4. PREPAID EXPENSES AND OTHER CURRENT ASSETS Prepaid expenses and other current assets consisted of the following:
|  | As of December 31, |
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|  | 2013 |  | 2014 |
Other current assets |  | $ | — |  | $ | 253 |
Initial public offering costs |  |  | — |  |  | 233 |
Employee advances |  |  | 21 |  |  | 33 |
Prepaid expenses |  |  | 33 |  |  | 8 |
Prepaid development costs |  |  | 656 |  |  | — |
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Prepaid expenses and other current assets |  | $ | 710 |  | $ | 527 |
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