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Net Loss per Share (Tables)
 12 Months Ended
Dec. 31, 2015
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
The following table provides a reconciliation of the numerator and denominator used in computing basic and diluted net loss per common share:
 
 
Years Ended December 31,
  
 
2015
 
2014
 
2013
Numerator:
 
  

 
  

 
 
Net loss (in thousands)
 
$
(30,384
)
 
$
(26,496
)
 
$
(15,278
)
Denominator:
 
  

 
  

 
 
Weighted-average shares used to compute basic net loss per share
 
57,172,659

 
55,932,641

 
55,135,657

Effect of dilutive options, unvested shares of restricted stock awards and unvested restricted stock units
 
—

 
—

 
—

Weighted-average shares used to compute diluted net income loss per share
 
57,172,659

 
55,932,641

 
55,135,657

Net loss per share:
 
  

 
  

 
 
Basic
 
$
(0.53
)
 
$
(0.47
)
 
$
(0.28
)
Diluted
 
$
(0.53
)
 
$
(0.47
)
 
$
(0.28
)
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share
The following outstanding options to purchase Common Stock, unvested shares under RSAs and unvested shares issuable upon settlement of RSUs were excluded from the computation of diluted net loss per share for the periods presented as their effect would have been anti-dilutive:
 
 
Years Ended December 31,
  
 
2015
 
2014
 
2013
Options to purchase common stock
 
4,078,626

 
4,688,256

 
5,210,384

Unvested shares of restricted stock awards
 
562,936

 
564,652

 
557,982

Unvested shares of restricted stock units
 
2,032,202

 
1,765,905

 
1,198,290