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Segments - Schedule of Sales Percentage by Therapeutic Category (Detail)	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
McKesson Corporation [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Third party net sales present	12.00%	16.00%	15.00%
AmerisourceBergen Corporation [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Third party net sales present	14.00%	15.00%	19.00%

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- Definition

Net sales present.

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No definition available.

+ Details

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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.

+ Details

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- Details

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- Details

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