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Common Stock Reserved for Issuance (Tables)
12 Months Ended
Dec. 31, 2018
Equity [Abstract]  
Schedule of Common Stock Reserved for Issuance

The Company is required to reserve and keep available out of its authorized but unissued shares of common stock a number of shares sufficient to effect the conversion of all outstanding options granted and available for grant under the incentive plans, shares reserved for issuance under the employee stock purchase plan and issued warrant.

 

     December 31,  
     2018      2017  

Outstanding stock options under equity incentive plans

     10,504,412        7,470,601  

Shares reserved for future option grants under equity plans

     1,945,025        1,503,770  

Shares reserved under the 2015 employee stock purchase plan

     700,000        700,000  

Shares reserved under warrant upon contingent events

     147,059        —    

Outstanding warrant

     73,529        —    
  

 

 

    

 

 

 

Total common stock reserved for issuance

     13,370,025        9,674,371