Net Loss per Share
 12 Months Ended
Dec. 31, 2015
Earnings Per Share [Abstract]  
Net Loss per Share
Net Loss per Share
Basic net loss per share is computed by dividing the net loss by the weighted-average number of shares of common stock outstanding during the period, less the weighted-average unvested common stock subject to repurchase. Diluted net loss per share is computed by giving effect to all potential shares of common stock, including Preferred Stock and outstanding stock options and warrants, to the extent dilutive. Basic and diluted net loss per share was the same for each period presented as the inclusion of all potential shares of common stock outstanding would have been anti-dilutive.
When shares of both Class A and Class B common stock are outstanding, net loss is allocated based on the contractual participation rights of the Class A and Class B common stock as if the earnings for the year have been distributed. As the liquidation and dividend rights are identical, the net loss is allocated on a proportionate basis. As of December 31, 2013, only shares of Class A common stock were outstanding and therefore no net loss was allocated.
 
The following table presents the calculation of basic and diluted net loss per share for our common stock (in thousands, except per share data):
 
Year Ended December 31,
 
2015
 
2014
 
2013
 
Class A
 
Class B
 
Class A
 
Class B
 
Class A
Net loss
$
(48,116
)
 
$
(31,804
)
 
$
(67,655
)
 
$
(18,285
)
 
$
(62,182
)
Weighted-average shares used to compute basic and diluted net loss per share
56,444

 
37,309

 
58,555

 
15,826

 
9,895

Basic and diluted net loss per share
$
(0.85
)
 
$
(0.85
)
 
$
(1.16
)
 
$
(1.16
)
 
$
(6.28
)

The following securities were excluded from the calculation of diluted net loss per share for common stock because their effect would have been anti-dilutive for the periods presented (in thousands):
 
Year Ended December 31,
 
2015
 
2014
 
2013
Convertible preferred stock
—

 
—

 
64,476

Stock options and restricted common stock
16,247

 
17,791

 
16,687

Warrants
115

 
115

 
175

 
$
16,362

 
$
17,906

 
$
81,338