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Income Taxes - Reconciliation of Income taxes Provided at Federal Statutory Rate to Actual Income Tax Provision (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income tax benefit computed at U.S. statutory rate	$ (542)	$ (2,393)	$ (3,815)
State income tax (net of federal benefit)		2	3
Foreign income tax at rate different from U.S. statutory rate		12	3
Research and development credits	(170)	(194)	(480)
Stock-based compensation			(40)
Amortization of intangible assets	(60)	(60)	(100)
Goodwill impairment	17	1,482
Federal tax rate reduction			(26,617)
Valuation allowance changes affecting tax provision	752	1,158	30,811
Other	3	6	2
Income tax provision	$ 0	$ 13	$ (233)

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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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