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Net Loss Per Share (Tables)
6 Months Ended
Jun. 30, 2017
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 and six months ended June 30, 2017 and 2016:
 
 
Common Stock Equivalents
Three and Six Months Ended June 30, 2017
 
Three and Six Months Ended June 30, 2016
Options to purchase common stock
7,888,763

 
6,694,478

Warrants to purchase common stock
284,091

 
284,091

Restricted stock units
1,335,744

 
749,335

Convertible preferred stock
8,456

 
8,456

Total
9,517,054

 
7,736,360