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Summary of Significant Accounting Policies - Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share, Convertible Preferred Stock (Detail) (Convertible Preferred Stock Excluded from EPS [Member])
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Convertible Preferred Stock Excluded from EPS [Member]
   
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potential common shares excluded from EPS 32,400us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_StatementClassOfStockAxis
= us-gaap_ConvertiblePreferredStockMember
32,400us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_StatementClassOfStockAxis
= us-gaap_ConvertiblePreferredStockMember