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Revenue Recognition - Additional Information (Detail)
12 Months Ended
Dec. 31, 2018
USD ($)
Segment
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%
Contract assets $ 0
Contract liabilities 0
Future performance obligations $ 0
Number of operating segments | Segment 7
Number of reporting segments | Segment 3