Summary of significant accounting policies - Share-based compensation (Details) |
12 Months Ended |
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Dec. 31, 2022 | |
| Accounting Policies [Abstract] | |
| Contractual term | 4 years |
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- References No definition available.
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| X | ||||||||||
- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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