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Accrued Expenses (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Schedule of Accrued Liabilities [Line Items]    
Legal and accounting fees $ 233 $ 118
Accrued compensation 485 604
Accrued clinical trial costs 73  
Other 6 7
Total $ 797 $ 729