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Net Loss Per Share (Tables)
 6 Months Ended
Jun. 30, 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
 
June 30, 2016
 
June 30, 2015
 
Class A
 
Class B
 
Class A
 
Class B
Numerator
 
 
 
 
 
 
 
Net loss
$
(8,219
)
 
$
(3,306
)
 
$
(7,578
)
 
$
(3,451
)
 
 
 
 
 
 
 
 
Denominator
 
 
 
 
 
 
 
Weighted-average common shares outstanding - basic and diluted
28,950,226

 
11,643,682

 
27,226,993

 
12,400,848

Basic and diluted net loss per share
$
(0.28
)
 
$
(0.28
)
 
$
(0.28
)
 
$
(0.28
)
 
Six months ended
 
June 30, 2016
 
June 30, 2015
 
Class A
 
Class B
 
Class A
 
Class B
Numerator
 
 
 
 
 
 
 
Net loss
$
(16,718
)
 
$
(6,852
)
 
$
(12,686
)
 
$
(5,790
)
 
 
 
 
 
 
 
 
Denominator
 
 
 
 
 
 
 
Weighted-average common shares outstanding - basic and diluted
28,742,233

 
11,780,557

 
27,197,080

 
12,413,825

Basic and diluted net loss per share
$
(0.58
)
 
$
(0.58
)
 
$
(0.47
)
 
$
(0.47
)
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
 
June 30, 2016
 
June 30, 2015
Shares subject to outstanding common stock options
7,433,402

 
6,523,356

Shares subject to unvested restricted stock awards
353,335

 
654,375