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SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED)
 12 Months Ended
Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]  
SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED)
SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED)

The tables below summarize the Company’s unaudited quarterly operating results for the year ended December 31, 2019:
 
For the Quarters Ended
 
 
March
 
June
 
September
 
December
 
 
(unaudited, in thousands)
 
Revenue
$
372

 
$
2,514

 
$
695

 
$
880

 
Research and development expenses
(8,751
)
 
(8,599
)
 
(9,027
)
(1)
(8,417
)
(2
)
General and administrative expenses
(3,357
)
 
(2,857
)
 
(2,898
)
(1)
(2,534
)
(2
)
Other income (expense), net
107

 
46

 
—

 
(47
)
 
Net loss
$
(11,629
)
 
$
(8,896
)
 
$
(11,230
)
 
$
(10,118
)
 
Comprehensive loss
$
(11,624
)
 
$
(8,887
)
 
$
(11,238
)
 
$
(10,121
)
 
Net loss per share, basic and diluted
$
(0.38
)
 
$
(0.29
)
 
$
(0.36
)
 
$
(0.31
)
 
____________________
(1)
Restructuring charges of $1.1 million were recorded during the quarter, of which $0.9 million was recorded in research and development expenses and $0.2 million recorded in general and administrative expenses.
(2)
Restructuring charges of $0.9 million were recorded during the quarter, of which $0.8 million was recorded in research and development expenses and $0.1 million recorded in general and administrative expenses.

The tables below summarize the Company’s unaudited quarterly operating results for the year ended December 31, 2018:
 
For the Quarters Ended
 
 
March
 
June
 
September
 
December
 
 
(unaudited, in thousands)
 
Revenue
$
4,784

 
$
2,182

 
$
944

 
$
476

 
Research and development expenses
(6,413
)
 
(8,375
)
 
(7,399
)
 
(8,234
)
 
General and administrative expenses
(2,990
)
 
(2,668
)
 
(2,696
)
 
(2,695
)
 
Other income (expense), net
(42
)
 
147

 
140

 
136

 
Net loss
$
(4,661
)
 
$
(8,714
)
 
$
(9,011
)
 
$
(10,317
)
 
Comprehensive loss
$
(4,661
)
 
$
(8,710
)
 
$
(9,021
)
 
$
(10,314
)
 
Net loss per share, basic and diluted
$
(0.18
)
 
$
(0.29
)
 
$
(0.29
)
 
$
(0.33
)