Income Taxes - Reconciliation Of Beginning And Ending Amount Of Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of period	$ 318	$ 343	$ 0
Additions for tax positions of prior years	0	0	343
Reductions for tax positions of prior years	(12)	(25)	0
Balance at end of period	$ 306	$ 318	$ 343