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Inventory - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2026 | Jun. 30, 2026 | Feb. 12, 2026 | Dec. 31, 2025
Inventory [Line Items] |  |  |  |  |
Inventory |  | $ 298,957 | $ 298,957 |  | $ 196,625
Work in process |  | 109,198 | 109,198 |  | 90,498
Finished goods | [1] | 119,650 | 119,650 |  | $ 37,740
Step-up Adjustment | Avadel Pharmaceuticals Plc |  |  |  |  |
Inventory [Line Items] |  |  |  |  |
Inventory |  |  |  | $ 121,600 |
Work in process |  |  |  | 19,100 |
Finished goods |  |  |  | $ 102,500 |
Step-up Adjustment | Avadel Pharmaceuticals Plc | Cost of goods manufactured and sold |  |  |  |  |
Inventory [Line Items] |  |  |  |  |
Inventory amortization |  | $ 31,000 | $ 43,700 |  |
[1] | At June 30, 2026 and December 31, 2025, the Company had $50.7 million and $31.7 million, respectively, of finished goods inventory located at its third-party warehouse and shipping service provider.

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