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NET LOSS PER SHARE (Tables)
 3 Months Ended
Mar. 31, 2018
Earnings Per Share [Abstract]  
Schedule of basic and diluted net loss per share
Basic and diluted net loss per share is calculated as follows (in thousands, except per share amounts):
 
 
 
Three Months Ended
March 31,
 
 
 
2018
 
2017
 
Net loss
 
$
(14,033
)
 
$
(8,230
)
 
Less net income attributable to non-controlling stockholders
 
27

 
—

 
Net loss attributable to common stock
 
$
(14,060
)

$
(8,230
)
 
Weighted average shares outstanding, basic and diluted
 
20,052

 
16,087

 
 
 


 


 
Net loss per share, basic and diluted
 
$
(0.70
)
 
$
(0.50
)
 
Anti-dilutive securities excluded from diluted net loss per share calculation for stock-based compensation plans
 
1,336

 
1,385