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8. Stockholders' Equity (Tables)
12 Months Ended
Dec. 31, 2018
Stockholders' deficit:  
Convertible preferred stock
          Shares Issued and  
    Authorized     Outstanding December 31,  
     Shares     2018     2017  
Series B preferred stock     7,235       1,323       1,323  
Undesignated     57,765              
      65,000       1,323       1,323