Net Income (Loss) Per Share
 9 Months Ended
Sep. 30, 2014
Earnings Per Share [Abstract]  
Net Income (Loss) Per Share
Net Income (Loss) Per Share
Immediately prior to the closing of our IPO in May 2013, all outstanding shares of our Series A preferred stock and Series B preferred stock were converted into Class B common stock. We issued 6,230,000 shares of Class A common stock in the IPO. In addition, 3,200,000 shares of Class B common stock (including 2,000,000 shares of Class B common stock issued upon the conversion of our preferred stock) held by our existing stockholders were converted into Class A common stock and sold in the IPO. As a result, as of September 30, 2014, Class A and Class B common stock are the only outstanding classes of capital stock of the Company. The rights of the holders of Class A and Class B common stock are identical, except with respect to voting and conversion. Each holder of Class B common stock is entitled to ten votes per share and each share of Class A common stock is entitled to one vote per share. Shares of Class B common stock may be converted into Class A common stock at any time at the option of the stockholder, and are automatically converted upon sale or transfer to Class A common stock, subject to certain limited exceptions.
 
Net income per share attributable to common stockholders is presented in conformity with the two-class method required for participating securities for periods in which we have net income. As all shares of Series A and Series B preferred stock were converted into shares of Class B common stock in connection with our IPO, there have been no shares of preferred stock outstanding since the IPO, and therefore there was no allocation to preferred shares in the three and nine months ended September 30, 2014 and 2013.

The following table presents the computation of basic and diluted net income (loss) per share attributable to common stockholders:    
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2014
 
2013
 
2014
 
2013
 
(in thousands, except per share amounts)
Basic net income (loss) attributable to common stockholders:
 
 
 
 
 
 
 
Net income (loss)
$
(4,631
)
 
$
2,441

 
$
(14,834
)
 
$
(4,169
)
Weighted average shares used to compute basic net income (loss) per share
68,966

 
59,143

 
66,923

 
47,093

Net income (loss) per share attributable to common stockholders - basic
$
(0.07
)
 
$
0.04

 
$
(0.22
)
 
$
(0.09
)
Diluted net income (loss) attributable to common stockholders:
 
 
 
 
 
 
 
Net income (loss)
$
(4,631
)
 
$
2,441


$
(14,834
)

$
(4,169
)
Weighted average shares used to compute basic net income (loss) per share
68,966

 
59,143

 
66,923

 
47,093

Effect of potentially dilutive shares:
 
 
 
 
 
 
 
Stock awards
—

 
12,205

 
—

 
—

Weighted average shares used to compute diluted net income (loss) per share
68,966

 
71,348

 
66,923

 
47,093

Net income (loss) per share attributable to common stockholders - diluted
$
(0.07
)
 
$
0.03

 
$
(0.22
)
 
$
(0.09
)
    
For the three months ended September 30, 2014 and the nine months ended September 30, 2014 and 2013, outstanding stock awards were antidilutive because of our net loss, and as such, their effect has not been included in the calculation of basic or diluted net loss per share attributable to common stockholders.

The following shares subject to outstanding common stock awards were excluded from the computation of diluted net loss per share attributable to common stockholders for the periods presented as their effect would have been antidilutive:    
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2014
 
2013
 
2014
 
2013
 
(in thousands)
Shares subject to outstanding common stock awards
11,253

 
6

 
11,253

 
15,468