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6. Stockholders' Equity (Tables)
12 Months Ended
Dec. 31, 2016
Stockholders' deficit:  
Convertible Preferred Stock
    Authorized     Shares Issued and  
    Shares     Outstanding December 31,  
          2016     2015  
Series B preferred stock     7,235       1328       1398  
Undesignated     57,765              
      65,000       1328       1398