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Income Taxes - Provision for Income Taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Current tax expense      
Federal $ 0 $ 0 $ 0
State 2 32 24
Foreign (10) 265 331
Total current tax (benefit) expense (8) 297 355
Deferred tax expense:      
Federal 0 0 0
State 0 0 0
Foreign (277) 0 0
Total deferred tax (benefit) expense (277) 0 0
Provision for (benefit from) income taxes $ (285) $ 297 $ 355