Face (par) amount of debt instrument at time of issuance.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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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.

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Borrowings - Additional Information (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017	Oct. 23, 2017
Debt Instrument [Line Items]
Principal amount	$ 104,700
5.75% Senior convertible notes due October 23, 2021
Debt Instrument [Line Items]
Principal amount	$ 18,690	$ 23,690	$ 23,700
Senior notes, effective interest rate	5.75%		5.75%
Maturity date	Oct. 23, 2021
Senior convertible notes due December 31, 2019
Debt Instrument [Line Items]
Principal amount	$ 12,000
Senior notes, effective interest rate	9.75%
Senior convertible notes due December 31, 2019 \| Notes Due and Payable On July 2018 at Earlier of October 31, 2018 or First Business Day \| United Therapeutics Corporation
Debt Instrument [Line Items]
Principal amount	$ 3,000
Senior convertible notes due December 31, 2019 \| Notes Due and Payable On July 2019 \| United Therapeutics Corporation
Debt Instrument [Line Items]
Principal amount	9,000
Senior convertible notes due December 31, 2019 \| Tranche B Notes
Debt Instrument [Line Items]
Principal amount	14,495	$ 54,407
Notes Due and Payable On May 2019 \| Tranche B Notes
Debt Instrument [Line Items]
Principal amount	$ 2,500
Senior notes, effective interest rate	8.75%