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Income Taxes (Details ) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets -liabilities):    
Reserves $ 12 $ 35
Property and equipment 80 171
Accrued expenses 619 1,034
Severance 56 39
Non-qualified stock options 268 420
Net foreign carryforwards 1,906 1,844
Net operating loss and credit carryforwards 6,801 8,054
Intangibles 605 907
Total deferred tax assets 10,347 12,504
Valuation allowance (10,896) (13,114)
Net deferred tax liabilities $ (549) $ (610)