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Income Taxes - Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Increase (decrease) in income taxes resulting from:
Income tax benefit at Federal statutory income tax rate	$ (4,571)	$ (4,203)
State income tax benefit, net of federal benefit	(600)	(610)
State research and development, investment credits	(213)	71
Non-deductible meals & entertainment	22	36
Non-deductible stock compensation expense	19	18
Foreign tax rate differential	235	(4)
Federal research and development credits	(707)	(490)
Uncertain tax positions	39	(110)
Provision to tax return adjustments	144	21
Change in valuation allowance	3,980	934
Loss on legal entity dissolution	0	244
Impairment of goodwill and intangibles	1,834	0
Other	(8)	90
Income tax expense (benefit)	$ 174	$ (4,003)

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