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Income Taxes - Unrecognized Tax Balances Roll-forward (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]    
Beginning of year $ 129 $ 57
Additions based on tax positions related to the current year 85 60
Additions for tax positions of prior years 4 12
Reductions due to the statute of limitations (20) 0
End of year $ 198 $ 129