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Revenue - Additional Information (Detail)
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
Disaggregation of Revenue [Line Items]  
Payment term on product sales range, description Payment terms on our product sales normally range from 30 to 90 days.
Other current liabilities [Member]  
Disaggregation of Revenue [Line Items]  
Refund obligation $ 14.8
Other Current Assets [Member]  
Disaggregation of Revenue [Line Items]  
Contract with customer, right to recover product, current $ 2.3