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Goodwill and intangible assets - Additional Information (Details) - USD ($)	9 Months Ended		12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Goodwill and intangible assets
Goodwill impairment loss	$ 0		$ 0
Goodwill	47,803,000		$ 47,803,000
Amortization expense	$ 2,095,000	$ 2,095,000

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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