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Capital Lease Obligations - Summary of Capital Lease Obligations (Parenthetical) (Detail) - Capital lease obligations, imputed interest at 4.75% [Member] - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Long Term Debt And Equity Financings [Line Items]    
Imputed interest rate for capital lease obligation 4.75% 4.75%
Monthly installment capital lease obligation $ 1,507 $ 1,507