Income Taxes - Components Of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current expense (benefit):
U.S. Federal	$ 4	$ (1)	$ 11
State	43	22	35
Foreign (non-U.S. entities)	99	80	51
Total current expense	146	101	97
Deferred expense (benefit):
U.S. Federal	(5)	0	2
State	(2)	0	1
Total deferred expense	(7)	0	3
Income Tax Expense (Benefit)	$ 139	$ 101	$ 100