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QUARTERLY FINANCIAL DATA (Tables)
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Data
The following is a summary of the quarterly results of the Company for the years ended December 31, 2017 and 2016 (unaudited, in thousands, except for per share data):
 
Three Months Ended
 
Year Ended
 
3/31/17
 
6/30/17
 
9/30/17
 
12/31/17
 
December 31, 2017
Operating loss
$
(18,090
)
  
$
(18,616
)
  
$
(16,601
)
  
$
(18,228
)
  
$
(71,535
)
Net loss
(17,846
)
 
(18,339
)
 
(16,350
)
 
(17,895
)
 
(70,430
)
Per common share:
 
 
 
 
 
 
 
 
 
Loss per share, basic and diluted (1)
$
(0.73
)
 
$
(0.74
)
 
$
(0.65
)
 
$
(0.67
)
 
$
(2.78
)
 

Three Months Ended
 
Year Ended
 
3/31/16
 
6/30/16
 
9/30/16
 
12/31/16
 
December 31, 2016
Operating loss
$
(22,118
)
  
$
(22,227
)
  
$
(19,581
)
  
$
(19,853
)
  
$
(83,779
)
Net loss
(21,914
)
 
(22,061
)
 
(19,421
)
 
(19,722
)
 
(83,118
)
Per common share:
 
 
 
 
 
 
 
 
 
Loss per share, basic and diluted(1)
$
(1.13
)
 
$
(1.11
)
 
$
(0.97
)
 
$
(0.99
)
 
$
(4.20
)


(1) Net loss per share is computed independently for each of the quarters presented. Therefore, the sum of the quarterly per-share calculations will not necessarily equal the annual per share calculation.