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Net Loss per Share (Tables)
3 Months Ended
Mar. 31, 2019
Earnings Per Share [Abstract]  
Potential Dilutive Shares Excluded from Computation of Diluted Net Loss Per Share Such potentially dilutive shares of common stock at March 31, 2019 and 2018 consisted of the following:
 
 
 
March 31,
 
 
 
2019
 
 
2018
 
Stock options
 
 
5,416,085
 
 
 
3,822,968
 
Unvested restricted stock
 
 
1,621,845
 
 
 
1,532,201
 
Warrants
 
 
18,939,394
 
 
 
 
Preferred stock
 
 
 
 
 
35,152,089
 
 
 
 
25,977,324
 
 
 
40,507,258