Income Taxes - Components of Income tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current:
U.S. federal		$ (50)	$ 42
U.S. State	$ 298	395	297
Outside United States	13	78	44
Total Current	311	423	383
Deferred:
U.S. federal	(276)	(3,727)	(9,734)
U.S. State	(71)	(64)	(427)
Outside United States	(1)
Total Deferred	(348)	(3,791)	(10,161)
Total	$ (37)	$ (3,368)	$ (9,778)