Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Summary of significant accounting policies - Capitalized Software Development Costs (Details)

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Summary of significant accounting policies - Capitalized Software Development Costs (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Accounting Policies [Abstract]      
Capitalized software development costs incurred $ 502 $ 387 $ 1,522
Capitalized software costs amortized during period $ 864 $ 1,006 $ 923