Investments and fair value measurements - Summary of the Changes in the Fair Value of Level 3 Financial Instruments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Preferred Stock
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 0	$ 10,311	$ 10,311	$ 12,104
Vesting and remeasurement of SARs	0	0	0	0
Exercises of SARs			0	0
Unrealized loss on strategic investments			(10,311)	(1,793)
Ending balance	0	10,311	0	10,311
Stock Appreciation Rights (SARs)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	16	30	48	462
Vesting and remeasurement of SARs	(6)	(4)	(31)	(183)
Exercises of SARs			(7)	(253)
Unrealized loss on strategic investments			0	0
Ending balance	$ 10	$ 26	$ 10	$ 26