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11. Stockholder's Equity (Tables)
 12 Months Ended
Dec. 31, 2015
Equity [Abstract]  
Common Stock Warrants
    Number of Warrants     Exercise Prices  
Balance, December 31, 2013     2,489,407     $ 0.25 - $4.50  
Warrants exercised     (310,625 )   $ 1.20-$1.60  
   Warrants expired     (1,451,865 )        
Balance, December 31, 2014     726,917     $ 0.25 - $4.50  
   Warrants expired     (476,917 )        
Balance, December 31, 2015     250,000     $ 0.25