Revenue from contracts with customers - Schedule of Provisions for Sales Discounts and Allowances (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2026 USD ($)
Disaggregation of Revenue [Line Items]
Beginning balance	$ 316,035
Current provisions relating to sales in current year	303,024
Adjustments relating to prior years	(14,507)
Payments relating to sales in current year	(138,978)
Payments relating to sales in prior years	(154,989)
Ending Balance	339,606
Avadel Acquisition
Disaggregation of Revenue [Line Items]
Avadel beginning balance as of February 12, 2026	29,021
Contractual Adjustments
Disaggregation of Revenue [Line Items]
Beginning balance	211,440
Current provisions relating to sales in current year	146,144
Adjustments relating to prior years	(8,772)
Payments relating to sales in current year	(11,666)
Payments relating to sales in prior years	(124,102)
Ending Balance	214,519
Contractual Adjustments \| Avadel Acquisition
Disaggregation of Revenue [Line Items]
Avadel beginning balance as of February 12, 2026	1,475
Discounts
Disaggregation of Revenue [Line Items]
Beginning balance	41,327
Current provisions relating to sales in current year	111,269
Adjustments relating to prior years	(5,347)
Payments relating to sales in current year	(100,040)
Payments relating to sales in prior years	(14,947)
Ending Balance	34,904
Discounts \| Avadel Acquisition
Disaggregation of Revenue [Line Items]
Avadel beginning balance as of February 12, 2026	2,642
Product Returns
Disaggregation of Revenue [Line Items]
Beginning balance	55,455
Current provisions relating to sales in current year	6,518
Adjustments relating to prior years	(674)
Payments relating to sales in prior years	(3,197)
Ending Balance	58,826
Product Returns \| Avadel Acquisition
Disaggregation of Revenue [Line Items]
Avadel beginning balance as of February 12, 2026	724
Other
Disaggregation of Revenue [Line Items]
Beginning balance	7,813
Current provisions relating to sales in current year	39,093
Adjustments relating to prior years	286
Payments relating to sales in current year	(27,272)
Payments relating to sales in prior years	(12,743)
Ending Balance	31,357
Other \| Avadel Acquisition
Disaggregation of Revenue [Line Items]
Avadel beginning balance as of February 12, 2026	$ 24,180