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Income Taxes - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jul. 24, 2020 | Oct. 02, 2019 | Jul. 02, 2019
Income Taxes [Line Items] |  |  |  |  |  |  |
Increase (decrease) in income tax provision |  | $ 6,754 | $ (12,537) |  |  |  |
Increase (decrease) in deferred income taxes |  | 7,431 | 6,334 | $ 19,152 |  |  |
Amortization | $ 3,701 | 3,701 | 11,602 |  |  |  |
Deferred income tax expense (benefit) |  | 680 | (5,453) | (18,223) |  |  |
Bankruptcy claims, amount paid to settle claims |  |  |  |  | $ 800 |  |
Unrecognized tax benefits | 2,483 | 2,483 | 3,806 | 4,597 |  |  |
Income tax penalties and interest expense |  | 203 | 555 | 725 |  |  |
Income tax penalties and interest accrued | 1,475 | 1,475 | 1,612 |  |  |  |
Unremitted earnings |  | 3,725 |  |  |  |  |
Deferred tax assets, tax credit carryforwards, research | 6,771 | 6,771 | 8,429 |  |  |  |
Orphan drug and R&D tax credit |  | 2,793 | 0 | 0 |  |  |
CARES Act, change in tax rate, deferred tax liability, income tax benefit | 9,124 |  |  |  |  |  |
CARES Act, cash tax refunds |  | 3,351 |  |  |  |  |
CARES Act, cash refund claims |  | 18,753 |  |  |  |  |
Provisional charge related to the re-measurement of its net deferred tax assets |  |  |  | $ 274 |  |  |
Ireland |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Increase (decrease) in deferred income taxes |  |  | (5,536) |  |  |  |
Increase (decrease) in valuation allowance, deferred tax asset, , amount |  |  | (5,536) |  |  |  |
Net operating loss carryforwards | 118,070 | 118,070 |  |  |  |  |
Operating loss carryforwards, valuation allowance (decrease) | 4,171 | 4,171 |  |  |  |  |
Gross research tax credit |  | 375 | 821 |  |  |  |
U.S. |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Amortization |  |  | 8,190 |  |  |  |
Deferred income tax expense (benefit) |  |  | (8,190) |  |  |  |
Net operating loss carryforwards | 46,003 | 46,003 |  |  |  |  |
Operating loss carryforwards, valuation allowance (decrease) | 60 | 60 |  |  |  |  |
France |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Operating loss carryforwards, valuation allowance (decrease) |  |  | (3,259) |  |  |  |
Gross research tax credit |  | 6,396 | $ 7,608 |  |  |  |
Internal Revenue Service (IRS) | Speciality Pharama |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Bankruptcy claims, amount of filed claims likely to be denied | 1,937 | 1,937 |  |  |  | $ 9,302 | $ 50,695
Bankruptcy claims, amount paid to settle claims | 1,937 | 1,937 |  |  |  |  |
FSC |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Net operating loss carryforwards | 10,365 | 10,365 |  |  |  |  |
U.S. Holdings |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Net operating loss carryforwards | $ 35,638 | $ 35,638 |  |  |  |  |

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