Goodwill and intangible assets - Summary of Change in Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Goodwill
Beginning balance at January 1,			$ 47,739	$ 18,402	$ 18,402
Additions to goodwill			0		29,337
Ending balance	$ 47,739		47,739		47,739
Intangible assets
Beginning balance at January 1,			32,932	12,567	12,567
Additions to intangible assets			0		26,120
Amortization	(1,700)	$ (1,700)	(5,188)	$ (4,064)	(5,755)
Ending balance	$ 27,744		$ 27,744		$ 32,932

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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