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Income Taxes - Net deferred tax assets (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Net operating loss carryforwards	$ 41,989	$ 40,742
Charitable contribution carryforwards	439	433
Research and experimentation credits	1,668	1,796
Capitalized intangibles	387	409
Stock-based compensation	119	127
Depreciation and amortization		1
Accrued compensation	16	20
Other	9	1
Total deferred tax assets	44,627	43,529
Valuation allowance	(44,627)	(43,529)
Net deferred tax assets	$ 0	$ 0

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