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Net Loss per Share (Tables)
 3 Months Ended
Mar. 31, 2015
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
The following table presents the calculation of basic and diluted net loss per share for our common stock (in thousands, except per share data):
 
Three Months Ended March 31,
 
 
2015
 
2014
 
 
Class A
 
Class B
 
Class A
 
Class B
 
Net loss
$
(12,562
)
 
$
(7,081
)
 
$
(21,983
)
 
$
(2,298
)
 
Weighted-average shares used to compute basic and diluted net loss per share
58,698

 
33,088

 
24,417

 
2,553

 
Basic and diluted net loss per share
$
(0.21
)
 
$
(0.21
)
 
$
(0.90
)
 
$
(0.90
)
 
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share
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):
 
Three Months Ended March 31,
 
2015
 
2014
Stock options and restricted common stock
15,898

 
17,931

Warrants
115

 
115

Total
16,013

 
18,046