| Revenue (Tables) | 3 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Mar. 31, 2022 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Revenue | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Summary of revenue categories | Revenue comprises the following categories (in thousands):  
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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef 
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| X | ||||||||||
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- References No definition available. 
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