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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits    
Unrecognized tax benefit at January 1 $ 48 $ 84
Changes to unrecognized tax benefits related to a prior period 0 2
Lapse of statute of limitations (48) (38)
Unrecognized tax benefit at December 31 $ 0 $ 48