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Segments - Schedule of Sales Percentage by Therapeutic Category (Detail) | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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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 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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