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Income Taxes - net deferred tax liability as presented in consolidated balance sheet (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Deferred tax liabilities $ (4,018) $ (5,882)
Net deferred tax liability (3,599) (5,448)
Other long-term assets    
Deferred tax assets 419 434
Deferred tax liability    
Deferred tax liabilities $ (4,018) $ (5,882)