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Contract balances for the year 2021 and 2020 (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Accounting Policies [Abstract] |  |  |
Accounts receivable net | $ 3,937 | $ 2,932 | $ 970
Contract liability | $ 1,444 | $ 411 | $ 575

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