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Loss Per Share (Tables)
6 Months Ended
Jun. 30, 2019
Earnings Per Share [Abstract]  
Schedule of Anti-dilutive Potential Shares Outstanding Activity

The following outstanding potentially dilutive shares have been excluded from the calculation of diluted net loss per share for the periods presented due to their anti-dilutive effect:

 

   As of June 30, 
   2019   2018 
Stock options   6,604,461    5,523,068 
Restricted stock   493,447    332,089