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Income Taxes (Details Textual) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax (Textual)      
Interest or penalties related to unrecognized tax benefits $ 0 $ 0 $ 0
Accrued interest and penalties related to uncertain tax 0 0  
Uncertain tax positions $ 80,000    
Description of income tax withholding Payments related to the license agreement with Sony Corporation are net of 10% income tax withholding as required by the Japanese government under the Sweden and Japan international tax treaty.    
Amount withheld to offset future tax income tax payable $ 0 $ 0 $ 42,000
Open tax years 1999 through 2014    
Federal [Member]      
Income Tax (Textual)      
Operating loss carryforwards $ 48,600,000    
Operating loss carryforwards, expiration date Dec. 31, 2028    
Deferred tax assets related to excess tax benefits for stock based compensation $ 547,000    
State [Member]      
Income Tax (Textual)      
Operating loss carryforwards $ 19,800,000    
Operating loss carryforwards, expiration date Dec. 31, 2030    
Deferred tax assets related to excess tax benefits for stock based compensation $ 28,000    
Foreign [Member]      
Income Tax (Textual)      
Operating loss carryforwards $ 0