Net Loss per Share of Common Stock (Tables)
 12 Months Ended
Dec. 31, 2013
Earnings Per Share [Abstract]  
Schedule of computation of the entity's basic and diluted net loss per share of common stock
The following table sets forth the computation of the Company’s basic and diluted net loss per share of common stock during the years ended December 31, 2013, 2012 and 2011 (in thousands, except for share and per share amounts):
 
Years Ended December 31,
 
2013
 
2012
 
2011
Net loss attributable to common stockholders
$
(8,819
)
 
$
(756
)
 
$
(38,675
)
Shares used in computing net loss per share of common stock, basic and diluted
44,958,120

 
42,966,448

 
9,698,880

Net loss per share of common stock, basic and diluted
$
(0.20
)
 
$
(0.02
)
 
$
(3.99
)
Schedule of antidilutive potential common shares
The following outstanding shares of common stock equivalents were excluded from the computation of diluted net loss per share of common stock for the periods presented because including them would have been antidilutive:
 
Years Ended December 31,
 
2013
 
2012
 
2011
Stock options to purchase common stock
6,468,743

 
7,426,417

 
8,229,597

RSUs
850,351

 
254,863

 
—

Common stock subject to repurchase
—

 
7,500

 
15,000

Common stock warrants
912,368

 
912,368

 
912,368