Income Taxes - Components of Deferred Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Deferred tax expense:
Federal	$ 8,523	$ 3,555
State	1,569	822
Foreign	(200)	200
Total deferred income taxes	9,892	4,577
Change in deferred tax valuation allowance	(9,892)	(4,577)
Net deferred income tax	$ 0	$ 0