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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
The table below summarizes the Company’s unaudited consolidated quarterly operating results for the year ended December 31, 2019:
 
For the Quarters Ended
 
March
 
June
 
September
 
December
 
(unaudited, in thousands, except per share data)
Collaboration revenue
$
3,492

 
$
2,573

 
$
1,183

 
$
669

Loss from operations
$
(4,593
)
 
$
(2,979
)
 
$
(6,055
)
 
$
(10,841
)
Net loss
$
(4,580
)
 
$
(3,654
)
 
$
(4,781
)
 
$
(10,862
)
Net income (loss) attributable to common stockholders
$
5,939

 
$
(3,817
)
 
$
(4,863
)
 
$
(10,862
)
Basic net income (loss) per common share attributable to common stockholders
$
10.08

 
$
(6.49
)
 
$
(1.65
)
 
$
(1.38
)
Diluted net loss per common share attributable to common stockholders
$
(2.48
)
 
$
(6.49
)
 
$
(1.65
)
 
$
(1.38
)

The table below summarizes the Company’s unaudited consolidated quarterly operating results for the year ended December 31, 2018:
 
For the Quarters Ended
 
March
 
June
 
September
 
December
 
(unaudited, in thousands, except per share data)
Collaboration revenue
$
5,000

 
$
373

 
$
3,042

 
$
2,473

Income (loss) from operations
$
764

 
$
(3,315
)
 
$
(2,299
)
 
$
(3,601
)
Net income (loss)
$
527

 
$
(3,552
)
 
$
(2,541
)
 
$
(3,670
)
Net loss attributable to common stockholders
$
(2,713
)
 
$
(4,417
)
 
$
(3,507
)
 
$
(4,535
)
Basic and diluted net loss per common share attributable to common stockholders
$
(4.63
)
 
$
(7.53
)
 
$
(5.98
)
 
$
(7.72
)