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Income Taxes - Net deferred tax assets (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Net operating loss carryforwards	$ 38,566	$ 51,758
Charitable contribution carryforwards	455	552
Research and experimentation credits	1,682	1,440
Capitalized intangibles	608	781
Stock based compensation	148	193
Depreciation and amortization	1	6
Accrued compensation	168	35
Other		14
Total deferred tax assets	41,628	54,779
Valuation allowance	(41,628)	(54,779)
Net deferred tax assets	$ 0	$ 0

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