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Net income (loss) per share
 9 Months Ended
Sep. 30, 2016
Earnings Per Share [Abstract]  
Net income (loss) per share
Net income (loss) per share
Basic net income (loss) per share is computed by dividing the net income (loss) by the weighted-average number of common shares outstanding during the period. Diluted net income (loss) per share is computed by dividing net income (loss) by the weighted-average number of common shares outstanding, including all potentially dilutive common shares.
The rights of the holders of Class A common stock and Class B common stock are identical, except with respect to voting and conversion. Each share of Class A common stock is entitled to one vote per share and each share of Class B common stock is entitled to ten votes per share. Each share of Class B common stock is convertible at any time at the option of the stockholder into one share of Class A common stock and has no expiration date. Each share of Class B common stock will convert automatically into one share of Class A common stock upon the date when the outstanding shares of Class B common stock represent less than 10% of the aggregate number of shares of common stock then outstanding. Class A common stock is not convertible into Class B common stock. The computation of the diluted net income (loss) per share of Class A common stock assumes the conversion of Class B common stock.
The following table presents the calculations of basic and diluted net income (loss) per share:
 
Three months ended
 
Nine months ended
(in thousands, except per share data)
September 30,
2016
 
September 30,
2015
 
September 30,
2016
 
September 30,
2015
 
 
 
 
 
 
 
 
Numerator:
 
 
 
 
 
 
 
Net income (loss)
$
(104,068
)
 
$
18,799

 
$
(303,294
)
 
$
70,582

 
 
 
 
 
 
 
 
Denominator:
 
 
 
 
 
 
 
Weighted-average common shares—basic for Class A and Class B common stock
140,124

 
135,800

 
138,875

 
133,755

Effect of potentially dilutive shares
—

 
10,255

 
—

 
13,446

Weighted-average common shares—diluted for Class A and Class B common stock
140,124

 
146,055

 
138,875

 
147,201

 
 
 
 
 
 
 
 
Net income (loss) per share:
 
 
 
 
 
 
 
Basic
$
(0.74
)
 
$
0.14

 
$
(2.18
)
 
$
0.53

Diluted
$
(0.74
)
 
$
0.13

 
$
(2.18
)
 
$
0.48


The following potentially dilutive shares were not included in the calculation of diluted shares outstanding as the effect would have been anti-dilutive:
 
Three months ended
 
Nine months ended
(in thousands)
September 30,
2016
 
September 30,
2015
 
September 30,
2016
 
September 30,
2015
Stock options, ESPP shares and RSUs
22,693

 
2,373

 
20,803

 
1,995