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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Gross unrecognized tax benefits—beginning balance $ 4,441 $ 4,191  
Increases (decrease) related to tax positions from prior years (268) (280) $ (266)
Increases related to tax positions taken during current year 412 530 675
Decreases related to tax positions taken during the current year 0 0 0
Gross unrecognized tax benefits—ending balance $ 4,585 $ 4,441 $ 4,191