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Related Party Transactions - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2016
Mar. 31, 2015
Jun. 30, 2016
Jun. 30, 2015
Related Party Transaction [Line Items]        
Dividends on preferred stocks $ 75,000   $ 150,000 $ 300,000
Consulting fee $ 425,000      
Term of agreement 2 years      
Golsen Group [Member]        
Related Party Transaction [Line Items]        
Dividends on preferred stocks   $ 300,000    
Dividends declared $ 0   $ 0