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Net Loss Per Share (Tables)
 12 Months Ended
Dec. 31, 2015
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
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
)
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share
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

 
—