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Basis of Presentation and Summary Accounting Policies - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Schedule Of Significant Accounting Policies [Line Items]            
Percentage of total annual net sales in the third and fourth quarters         60.00% 61.00%
Shipping and handling revenue $ 313,000.0 $ 219,000.0 $ 1,000,000 $ 900,000