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SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) (Tables)
 12 Months Ended
Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Information
Selected quarterly financial data for the year ended December 31, 2019 and 2018 is presented below:
(unaudited; in thousands except per share data)
 
 
  2019
 
First Quarter
 
Second Quarter
 
Third Quarter
 
Fourth Quarter
Total revenues
 
$
516

 
$
1,391

 
$
103

 
$
5,133

Loss from operations
 
$
(23,868
)
 
$
(26,159
)
 
$
(23,437
)
 
$
(13,900
)
Net loss
 
$
(24,528
)
 
$
(26,936
)
 
$
(32,032
)
 
$
(28,981
)
Net loss per share attributable to common shareholders - basic and diluted
 
$
(5.54
)
 
$
(5.85
)
 
$
(6.79
)
 
$
(5.82
)
 
  2018
 
First Quarter
 
Second Quarter
 
Third Quarter
 
Fourth Quarter
Total revenues
 
$
154

 
$
362

 
$
292

 
$
312

Loss from operations
 
$
(22,104
)
 
$
(23,567
)
 
$
(23,228
)
 
$
(26,567
)
Net loss
 
$
(22,840
)
 
$
(24,175
)
 
$
(23,801
)
 
$
(27,220
)
Net loss per share attributable to common shareholders - basic and diluted
 
$
(6.83
)
 
$
(5.95
)
 
$
(5.49
)
 
$
(6.27
)