Income Taxes (Details Narrative) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Decrease in net valuation allowance	$ (2,600)	$ (400)
Unrecognized tax benefits that would impact effective tax rate	100	100
Income tax penalties and interest accrued	100	$ 100
Federal
Operating loss carryforwards	145,600
Research and development credit carryforwards	2,800
State
Operating loss carryforwards	80,300
Research and development credit carryforwards	$ 2,400