Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Income Taxes
Computed "expected" tax-benefit - Federal	$ (2,124)	$ (3,230)
Computed "expected" tax-benefit - State	(616)	(729)
Non-deductible stock-based compensation	32	864
State tax rate adjustment	(1,221)	0
Change in valuation allowance	3,929	3,095
Income tax expense	$ 0	$ 0

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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