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Stockholders' Equity - Additional Information - Shares Issued for Vested Restricted Stock Units (Detail) - shares
6 Months Ended
Mar. 05, 2015
Jun. 30, 2015
Schedule Of Stockholders Equity [Line Items]    
Shares issued for vested restricted stock units, Shares   56,500
Employee [Member]    
Schedule Of Stockholders Equity [Line Items]    
Shares issued for vested restricted stock units, Shares 56,500