Income taxes - Narrative (Details) - USD ($)			3 Months Ended		9 Months Ended
	Sep. 30, 2024	Mar. 31, 2024	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Operating Loss Carryforwards [Line Items]
Other Tax Expense (Benefit)			$ 100,000	$ 100,000	$ 500,000	$ 100,000
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount		$ 294,900,000	(1,600,000)		293,400,000
Income tax (benefit) expense			2,083,000	689,000	301,625,000	(11,562,000)
Loss before income taxes			(6,128,000)	(2,995,000)	(93,495,000)	(62,327,000)
Income tax (benefit) expense			2,083,000	689,000	301,625,000	(11,562,000)
Loss before income taxes			(6,128,000)	(2,995,000)	(93,495,000)	(62,327,000)
Current Foreign Tax Expense (Benefit)			2,100,000	1,000,000.0	5,000,000.0	14,400,000
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount		$ 294,900,000	(1,600,000)		293,400,000
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions	$ (3,900,000)
Unrecognized Tax Benefits	29,800,000		29,800,000		29,800,000		$ 25,800,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 14,000,000.0		14,000,000.0		14,000,000.0
Income Tax Effects Allocated Directly to Equity, Other			1,900,000	1,700,000	4,900,000	2,400,000
Restructuring adjustments			$ 300,000	$ 100,000	$ 1,300,000	$ 300,000