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Income Taxes - Unrecognized Tax Benefit (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reconciliation of Unrecognized Tax Benefits [Roll Forward]      
Gross unrecognized tax benefits at beginning of year $ 576 $ 1,112 $ 1,088
Increases in tax positions for prior years 166 87 130
Decreases in tax positions for prior years (141) (387) (33)
Increases in tax positions for current years 1,661 0 182
Decreases in tax positions for current years 0 (167) 0
Increases (decreases) from lapse in statute of limitations 114 (69) (255)
Gross unrecognized tax benefits at end of year $ 2,376 $ 576 $ 1,112