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10. Stockholders' Equity (Details-Stock Option Activity) (Stock Options [Member], USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Stock Options [Member]
      
Outstanding Options      
Options outstanding, beginning balance 1,814,000 4,314,000  
Options granted 1,280,000 452,000  
Options exercised (30,000) 0  
Options cancelled (245,000) (1,351,000)  
Options forfeited (102,000) (1,596,000)  
Options expired (53,000) (5,000)  
Options outstanding, ending balance 2,664,000 1,814,000 4,314,000
Options vested and exercisable 1,315,000    
Weighted average exercise price per share      
Options outstanding, beginning balance $ 0.66 $ 0.59  
Options granted $ 0.27 $ 0.15  
Options exercised $ 0.17    
Options cancelled $ 0.49 $ 0.51  
Options forfeited $ 0.19 $ 0.45  
Options expired $ 1.09 $ 0.98  
Options outstanding, ending balance $ 0.50 $ 0.66 $ 0.59
Options vested and exercisable $ 0.76    
Weighted average remaining contractual life      
Options outstanding, ending balance 7 years 1 month 20 days 6 years 4 months 13 days 7 years 8 months 26 days
Options vested and exercisable 5 years 1 month 20 days    
Aggregate Intrinsic Value      
Options outstanding, beginning balance $ 25,000 $ 2,000  
Options outstanding, ending balance 706,000 25,000 2,000
Options vested and exercisable $ 201,000