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Income Taxes - Rollforward of Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]    
Unrecognized tax benefits, beginning $ 239 $ 725
Increase related to current year tax positions 7 15
Settlements (68) (501)
Unrecognized tax benefits, ending $ 178 $ 239