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NET LOSS PER SHARE (Tables)
 9 Months Ended
Sep. 30, 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
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