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Income Taxes - Net deferred tax assets (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Net operating loss carryforwards	$ 40,742	$ 38,566
Charitable contribution carryforwards	433	455
Research and experimentation credits	1,796	1,682
Capitalized intangibles	409	608
Stock-based compensation	127	148
Depreciation and amortization	1	1
Accrued compensation	20	168
Other	1
Total deferred tax assets	43,529	41,628
Valuation allowance	(43,529)	(41,628)
Net deferred tax assets	$ 0	$ 0

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