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Net Loss Per Share (Tables)
3 Months Ended
Mar. 31, 2019
Earnings Per Share [Abstract]  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share
The following table summarizes potential shares of common stock that were excluded from the diluted net loss per share calculation because of their anti-dilutive effect for the three months ended March 31, 2019 and 2018:
 
 
Common Stock Equivalents
2019
 
2018
Options to purchase common stock
11,027,600

 
9,467,477

Warrants to purchase common stock

 
284,091

Restricted stock units
1,720,128

 
1,791,886

Convertible preferred stock
8,456

 
8,456

Convertible notes
14,585,653

 

Total
27,341,837

 
11,551,910