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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