Selling, general and administrative expenses (Details) - USD ($)	2 Months Ended	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Oct. 31, 2022	Oct. 31, 2021
Other Income and Expenses [Abstract]
Employee salaries and benefits		$ (31,500,000)	$ (5,400,000)	$ (22,500,000)	$ (7,400,000)
Professional fees		(20,800,000)	(3,500,000)	(16,300,000)	(7,900,000)
Stock-based compensation		(10,200,000)	(1,800,000)	(16,100,000)	(3,200,000)
Office, administrative and travel		(22,200,000)	(3,600,000)	(17,100,000)	(3,200,000)
Depreciation		(2,100,000)	(100,000)	(500,000)	(100,000)
Marketing		(2,500,000)	(300,000)	(2,300,000)	(900,000)
Write-off of property, plant and equipment		(2,800,000)	0	0	0
Bad debt expense	$ 0	(1,200,000)	0	0	0
Other		(100,000)	0	(100,000)	0
Total selling, general, and administrative expense	(14,700,000)	(93,400,000)	$ (14,700,000)	(74,900,000)	(22,700,000)
Severance costs	$ 0	$ 2,000,000		$ 0	$ 0