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Accrued Expenses - Summary of Accrued Expenses (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Payables and Accruals [Abstract]    
Employee related expenses $ 1,294 $ 1,279
Development costs 3,036 2,788
Professional services 803 574
Other accrued expenses 31 46
Total accrued expenses $ 5,164 $ 4,687