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Percentage of Accounts Receivable by Significant Customers (Detail) - Customer Concentration Risk - Accounts Receivable	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
GE Healthcare
Concentration Risk [Line Items]
Accounts receivable, percentage by customer	21.00%	11.00%
MilliporeSigma
Concentration Risk [Line Items]
Accounts receivable, percentage by customer	14.00%	19.00%

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

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