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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
12 Months Ended
Dec. 31, 2017
Accounting Policies [Abstract]  
Schedule of potentially dilutive securities in calculation of diluted net loss per share allocable to common stockholders

The table below presents potentially dilutive securities that could affect our calculation of diluted net loss per share allocable to common stockholders for the periods presented.

 

   As of December 31, 
   2017   2016   2015 
Stock options   23,365,225    21,767,854    20,725,325 
Warrants   3,115,905    12,060,071    12,722,431 
    26,481,130    33,827,925    33,447,756