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Revenue - Additional Information (Detail)
$ in Millions
9 Months Ended
Sep. 30, 2018
USD ($)
Disaggregation of Revenue [Line Items]  
Payment term on product sales range, description Payment terms on our product sales range from 30 to 90 days.
Other current liabilities [Member]  
Disaggregation of Revenue [Line Items]  
Refund obligation $ 12.7
Other current assets [Member]  
Disaggregation of Revenue [Line Items]  
Contract with customer, right to recover product, current $ 2.2