Income Taxes - Components of Federal, State and Foreign Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Current:
Foreign	$ 84
Total current tax expense	84
Deferred:
Foreign	(775)	$ (799)
Total deferred tax benefit	(775)	(799)
Income tax benefit	$ (691)	$ (799)