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Revenue Recognition - Additional Information (Detail)
9 Months Ended 12 Months Ended
Sep. 30, 2018
USD ($)
Segment
Dec. 31, 2017
Revenue Recognition [Abstract]    
Percentage of sales through direct channel   80.00%
Period terms for payment   90 days
Percentage of sales through indirect channel   20.00%
Significant multiple element arrangements $ 0  
Contract assets 0  
Contract liabilities 0  
Future performance obligations $ 0  
Number of operating segments | Segment 7  
Number of reporting segments | Segment 3