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Income Taxes - net deferred tax liability as presented in consolidated balance sheet (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deferred tax liability $ (5,882) $ (21)
Net deferred tax liability (5,448) (21)
Other long-term assets    
Deferred tax assets 434  
Deferred tax liability    
Deferred tax liability $ (5,882) $ (21)