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Commitments and Contingencies - Additional Information (Detail) - USD ($)
9 Months Ended 34 Months Ended
Sep. 30, 2015
Sep. 30, 2015
December 7, 2012 Agreement [Member]    
Commitment And Contingencies [Line Items]    
Commitment towards investments in joint venture $ 1,200,000  
Contribution to joint venture   $ 850,000
December 9, 2014 Agreement [Member]    
Commitment And Contingencies [Line Items]    
Commitment towards investments in joint venture $ 1,000,000