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Accrued Expenses (Details) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | ---
ACCRUED EXPENSES |  |  |
Accrued compensation | $ 1,169 | $ 635 | $ 449
Accrued development costs | 597 | 970 | 520
Accrued marketing | 685 |  |
Accrued audit and legal | 109 | 249 | 12
Accrued interest | 31 | 71 |
Accrued other | 90 | 31 | 32
Total accrued expenses | $ 2,681 | $ 1,956 | $ 1,013

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