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7. Stockholders' Equity (Tables)
12 Months Ended
Dec. 31, 2015
Stockholders' deficit:  
Convertible Preferred Stock
          Shares Issued and  
    Authorized     Outstanding December 31,  
    Shares     2015     2014  
Series B preferred stock     7,235       1398       1665  
Undesignated     57,765              
      65,000       1398       1665