Quarterly report pursuant to Section 13 or 15(d)

7. Stockholders' Equity (Tables)

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7. Stockholders' Equity (Tables)
3 Months Ended
Mar. 31, 2017
Equity [Abstract]  
Option activity
    Number of options     Weighted-average exercise price     Weighted-average contractual term  
Outstanding at December 31, 2016     709,025     $ 129.43       8.93  
Granted                    
Expired                    
Forfeit                    
Exercised                    
Outstanding at March 31, 2017     709,025     $ 129.43       8.68  
Exercisable at March 31, 2017     642,357     $ 144.53          
Warrant activity
    Number of warrants     Weighted average exercise price  
Balance at December 31, 2016     1,407,647     $ 11.70  
Warrants issued during the period     29,284,193     $ 1.66  
Warrants exchanged for other securities     (96,185 )   $ 12.46  
Warrants exercised during the period         $  
Warrants expired during the period         $  
Balance at March 31, 2017     30,595,655     $ 2.09  
Antidilutive Securities
    For the Three Months Ended March 31,  
    2017     2016  
Warrants     30,595,665       229,952  
Convertible preferred stock     595,556       380,766  
Convertible debt     10,007,141       293,045  
Stock options     709,025       60,756  
      41,907,387       964,519