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Notes Payable - Schedule of Principal Payments of Debt (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Debt Disclosure [Abstract]    
2016 $ 1,343  
2017 300  
2018 300  
2019 300  
2020 3,300  
Total revolving credit agreement $ 5,543 $ 4,000