Income Taxes - Components of Income (Loss) Before Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating Loss Carryforwards [Line Items]
Loss before income taxes	$ (9,665)	$ (8,137)	$ (17,286)
U.S. loss
Operating Loss Carryforwards [Line Items]
Loss before income taxes	(9,632)	(8,056)	(17,066)
Non U.S. loss
Operating Loss Carryforwards [Line Items]
Loss before income taxes	$ (33)	$ (81)	$ (220)