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Intangible Assets - Additional Information (Detail) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Goodwill And Intangible Assets Disclosure [Abstract]    
Impairment charge   $ 0
Subsequent impairment of the underlying assets $ 0  
Expected amortization expense for the remainder of 2016 500,000  
Expected amortization expense for 2017 900,000  
Expected amortization expense for 2018 900,000  
Expected amortization expense for 2019 900,000  
Expected amortization expense for 2020 $ 200,000