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v3.22.1

Summary of significant accounting policies (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Summary of significant accounting policies |  |
Engineering segment backlog | $ 5,400 | $ 11,581

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Balance Type: | credit
Period Type: | instant

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Namespace Prefix: | us-gaap_
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