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Stockholders' Equity - Amortization Schedule of Total Unamortized Shares of Restricted Stock Outstanding (Detail) - Restricted Stock [Member] - shares
Jun. 30, 2016
Dec. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
2016 (6 months) 16,469  
2017 22,622  
2018 13,012  
2019 6,535  
2020 2,297  
2021 392  
Total Non-vested Shares 61,327 37,245