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Net Loss Per Share (Tables)
 3 Months Ended
Mar. 31, 2016
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):
 
Three months ended
 
March 31, 2016
 
March 31, 2015
 
Class A
 
Class B
 
Class A
 
Class B
Numerator
 
 
 
 
 
 
 
Net loss
$
(8,496
)
 
$
(3,549
)
 
$
(5,110
)
 
$
(2,337
)
 
 
 
 
 
 
 
 
Denominator
 
 
 
 
 
 
 
Weighted-average common shares outstanding - basic and diluted
28,534,236

 
11,917,432

 
27,166,753

 
12,426,947

Basic and diluted net loss per share
$
(0.30
)
 
$
(0.30
)
 
$
(0.19
)
 
$
(0.19
)
 
 
 
 
 
 
 
 
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
 
March 31, 2016
 
March 31, 2015
Shares subject to outstanding common stock options
7,500,616

 
6,091,831

Shares subject to unvested restricted stock awards
423,360

 
584,350