Goodwill and intangible assets - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021
Goodwill and intangible assets
Goodwill impairment loss	$ 0	$ 0
Goodwill	47,803	47,803
Amortization of intangible assets	2,793	$ 2,793
2023	2,800
2024	2,800
2025	2,700
2026	2,700
2027	2,700
Thereafter	$ 3,900

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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