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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 attributable to common stockholders is computed by dividing the net loss attributable to common stockholders by the weighted-average number of shares of common stock outstanding during the period. Diluted net loss per share is computed by giving effect to all potential shares of common stock, including our outstanding stock options and stock related to unvested restricted stock awards to the extent dilutive.
The net loss per share attributable to common stockholders is allocated based on the contractual participation rights of the Class A and Class B common shares as if the loss for the year has been distributed. As the liquidation and dividend rights are identical, the net loss attributable to common stockholders is allocated on a proportionate basis.
We consider unvested restricted stock awards granted under the 2014 Equity Incentive Plan to be participating securities because holders of such shares have non-forfeitable dividend rights in the event of our declaration of a dividend for common shares. In future periods to the extent we are profitable, we will subtract earnings allocated to these participating securities from net income to determine net income attributable to common stockholders.
A reconciliation of the denominator used in the calculation of basic and diluted loss per share is as follows (in thousands, except share and per share data):
 
Year ended
 
December 31, 2015
 
December 31, 2014
 
December 31, 2013
 
Class A
 
Class B
 
Class A
 
Class B
 
Class A
 
Class B
Numerator
 
 
 
 
 
 
 
 
 
 
 
Net loss
$
(30,075
)
 
$
(13,324
)
 
$
(25,259
)
 
$
(15,895
)
 
$
(18,016
)
 
$
(11,528
)
 
 
 
 
 
 
 
 
 
 
 
 
Denominator
 
 
 
 
 
 
 
 
 
 
 
Weighted-average common shares outstanding - basic and diluted
27,617,350

 
12,235,274

 
19,736,342

 
12,419,718

 
19,133,028

 
12,243,575

Basic and diluted net loss per share
$
(1.09
)
 
$
(1.09
)
 
$
(1.28
)
 
$
(1.28
)
 
$
(0.94
)
 
$
(0.94
)

The anti-dilutive securities excluded from the weighted-average shares used to calculate the diluted net loss per common share were as follows:
 
As of December 31,
 
2015
 
2014
 
2013
Shares subject to outstanding common stock options
6,969,133

 
6,089,938

 
3,411,237

Shares subject to unvested appreciation units and participation units
—

 
—

 
108,975

Shares subject to unvested restricted stock awards
600,025

 
54,350

 
—