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NET LOSS PER SHARE (Tables)
 9 Months Ended
Sep. 30, 2019
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,
 
 
 
2019
 
2018
 
2019
 
2018
 
Net loss
 
$
(23,849
)
 
$
(15,454
)
 
$
(62,006
)
 
$
(43,971
)
 
Less net income attributable to non-controlling interests
 
21

 
25

 
63

 
75

 
Net loss attributable to shareholders
 
$
(23,870
)

$
(15,479
)
 
$
(62,069
)
 
$
(44,046
)
 
Weighted average shares outstanding, basic and diluted
 
23,671

 
20,206

 
23,703

 
19,968

 
Net loss per share, basic and diluted
 
$
(1.01
)
 
$
(0.77
)
 
$
(2.62
)
 
$
(2.21
)
 
Anti-dilutive securities excluded from diluted net loss per share calculation for stock-based compensation plans
 
1,920

 
1,065

 
1,920

 
1,065