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Percentage of Revenue from Significant Customers (Detail) - Customer Concentration Risk - Sales Revenue | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
MilliporeSigma |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenue from significant customers as a percentage of total revenue | 18.00% | 14.00% | 17.00% | 18.00%
GE Healthcare |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenue from significant customers as a percentage of total revenue | 16.00% | 17.00% | 16.00% | 24.00%

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