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Subsequent Events - Additional Information (Detail) - USD ($) $ in Millions | Oct. 18, 2018 | Sep. 26, 2018 | Oct. 16, 2018
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Deerfield | Tenth Amendment to Facility Agreement | Senior convertible notes due December 31, 2019 |  |  |
Subsequent Event [Line Items] |  |  |
Cash repayment of senior notes under exchange agreement |  | $ 3.0 |
Subsequent Event | Deerfield | Tenth Amendment to Facility Agreement | Senior convertible notes due December 31, 2019 |  |  |
Subsequent Event [Line Items] |  |  |
Cash repayment of senior notes under exchange agreement | $ 3.0 |  |
United Therapeutics Corporation | Subsequent Event | Deerfield | Tenth Amendment to Facility Agreement |  |  |
Subsequent Event [Line Items] |  |  |
Upfront payment received |  |  | $ 45.0
United Therapeutics Corporation | Collaboration and License Agreement | Subsequent Event |  |  |
Subsequent Event [Line Items] |  |  |
Upfront payment received |  |  | $ 45.0

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- Definition The cash outflow for a long-term debt where the holder has highest claim on the entity's asset in case of bankruptcy or liquidation during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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