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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% |  |

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