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PREPAID EXPENSES AND OTHER CURRENT ASSETS (Details) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | ---
PREPAID EXPENSES AND OTHER CURRENT ASSETS |  |  |
Other current assets |  | $ 253 |
Initial public offering costs |  | 233 |
Employee advances |  | 33 | $ 21
Prepaid expenses |  | 8 | 33
Prepaid development costs |  |  | 656
Total prepaid expenses and other current assets | $ 866 | $ 527 | $ 710

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