Net Loss Per Share Available to Common Stockholders (Tables)
 9 Months Ended
Sep. 30, 2016
Earnings Per Share [Abstract]  
Antidilutive Shares Excluded from Computation of Diluted Net Income (Loss) Per Share

The following outstanding shares subject to stock options, restricted stock units, and warrants to purchase common stock were antidilutive due to a net loss in the periods presented and, therefore, were excluded from the dilutive securities computation as of the three and nine months ended September 30, 2016 and 2015 as indicated below:

 

 

 

September 30,

 

 

 

2016

 

 

2015

 

Excluded potentially dilutive securities(1):

 

 

 

 

 

 

 

 

Shares subject to outstanding options to purchase common stock

 

 

2,786,882

 

 

 

2,103,390

 

Unvested restricted stock units

 

 

440,500

 

 

 

262,000

 

Shares subject to warrants to purchase common stock

 

 

42,306

 

 

 

47,423

 

Totals

 

 

3,269,688

 

 

 

2,412,813

 

 

(1)

The number of shares is based on the maximum number of shares issuable on exercise or conversion of the related securities as of September 30, 2016 and 2015. Such amounts have not been adjusted for the treasury stock method or weighted average outstanding calculations as required if the securities were dilutive.