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NET LOSS PER SHARE (Tables)
 6 Months Ended
Jun. 30, 2017
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
June 30,
 
Six Months Ended
June 30,
 
 
2017
 
2016
 
2017
 
2016
Net loss attributable to common stock
 
$
(19,283
)

$
(10,693
)
 
$
(27,513
)

$
(20,336
)
Weighted average shares outstanding, basic and diluted
 
79,507

 
52,062

 
71,971


52,241

 
 


 


 


 


Net loss per share, basic and diluted
 
$
(0.24
)
 
$
(0.21
)
 
$
(0.38
)
 
$
(0.39
)
Anti-dilutive securities excluded from diluted net loss per share calculation for stock-based compensation plans
 
6,255

 
6,084

 
6,255

 
6,084