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Income Taxes (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Income Taxes [Abstract]    
Income tax benefit
Deferred tax assets:    
Depreciation $ 113,000 $ 113,000
Allowance for bad debts 211,000 108,000
Net operating loss carry-forwards 23,628,000 25,469,000
Stock option expense 1,358,000 1,439,000
Research and other credits 1,154,000 1,031,000
Other temporary differences 15,000 15,000
Total gross deferred tax assets 26,479,000 28,175,000
Less valuation allowance $ (26,479,000) $ (28,175,000)
Deferred Tax Assets, Net of Valuation Allowance
Operating Loss Carryforwards [Line Items]    
Net operating loss carry-forward $ 67,000,000  
Research and other credit carry-forwards 1,154,000  
Decrease in valuation allowance $ 1,696,000  
Earliest Tax Year [Member]    
Operating Loss Carryforwards [Line Items]    
Net operating loss carry-forward expiration dates Dec. 31, 2016  
Research and other credit carry-forwards expiration dates Dec. 31, 2016  
Latest Tax Year [Member]    
Operating Loss Carryforwards [Line Items]    
Net operating loss carry-forward expiration dates Dec. 31, 2035  
Research and other credit carry-forwards expiration dates Dec. 31, 2035