Income Taxes (Details 3) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred Tax Assets, Net [Abstract]
Fixed assets	$ 66	$ 64
Accruals and reserves	2,673	147
Stock options	179	196
Net operating loss carryforwards	35,522	35,254
Federal and state credits	3,461	3,461
Foreign credits	152	165
Intangible assets	2,139	2,442
Research and development expense	2,224	2,542
Gross deferred tax assets	46,416	44,271
Valuation allowance	(46,283)	(44,100)
Total deferred tax assets	133	171
Deferred Tax Liabilities	(543)	(543)
Net deferred tax asset/liabilities	$ (410)	$ (372)