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Basis of Presentation - Additional Information (Detail)
Nov. 09, 2016
shares
Sep. 30, 2016
shares
Dec. 31, 2015
shares
Dec. 31, 2014
shares
Organization Consolidation And Presentation Of Financial Statements [Line Items]        
Common stock, shares authorized   33,000,000 33,000,000 33,000,000
Subsequent Event        
Organization Consolidation And Presentation Of Financial Statements [Line Items]        
Common stock split ratio 2,200      
Common stock, shares authorized 350,000,000      
Effective date of stock split Nov. 09, 2016