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Income Taxes - Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Increase (decrease) in income taxes resulting from:
Income tax benefit at Federal statutory income tax rate	$ (2,073)	$ (4,571)
State income tax benefit, net of federal benefit	(342)	(600)
State research and development, investment credits	(137)	(213)
Non-deductible meals & entertainment	1	22
Non-deductible stock compensation expense	(194)	19
Non-deductible compensation under 162(m)	35	0
Foreign tax rate differential	58	235
Federal research and development credits	(607)	(707)
Uncertain tax positions	32	39
Provision to tax return adjustments	33	144
Change in valuation allowance	4,648	3,980
PPP loan forgiveness	(1,455)	0
Impairment of goodwill and intangibles	0	1,834
Prior period adjustments	(117)	0
Other	10	(8)
Income tax (benefit) expense	$ (108)	$ 174

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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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