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Income Taxes - Components of Income Tax Expense (Benefit) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Current provision for income taxes:      
State $ 40 $ 49 $ 44
Foreign 1,057 1,716 953
Total current 1,097 1,765 997
Deferred tax expense (benefit):      
Federal 2 3 (13)
Foreign 224 (361) 98
Total deferred 226 (358) 85
Provision for income taxes $ 1,323 $ 1,407 $ 1,082