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NET LOSS PER SHARE
 9 Months Ended
Sep. 30, 2018
Earnings Per Share [Abstract]  
NET LOSS PER SHARE
NET LOSS PER SHARE

We compute basic net loss per share by dividing net loss attributable to our common stockholders by the weighted average number of shares of common stock outstanding during the period. We exclude all outstanding options and unvested restricted stock as such securities are anti-dilutive for all periods presented.

Basic and diluted net loss per share is calculated as follows (in thousands, except per share amounts): 
 
 
Three Months Ended
September 30,
 
Nine Months
Ended
September 30,
 
 
2018
 
2017
 
2018
 
2017
Net loss
 
$
(15,081
)
 
$
(10,863
)
 
$
(43,014
)
 
$
(38,377
)
Less net income attributable to non-controlling interests
 
25

 
32

 
75

 
32

Net loss attributable to common stock
 
$
(15,106
)

$
(10,895
)
 
$
(43,089
)
 
$
(38,409
)
Weighted average shares outstanding, basic and diluted
 
20,206

 
19,929

 
19,968

 
18,645

Net loss per share, basic and diluted
 
$
(0.75
)
 
$
(0.56
)
 
$
(2.16
)
 
$
(2.04
)
Anti-dilutive securities excluded from diluted net loss per share calculation for stock-based compensation plans
 
1,065

 
1,460

 
1,065

 
1,460