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Selected Quarterly Financial Data (Unaudited)
 12 Months Ended
Dec. 31, 2018
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, 2018:
 
For the Quarters Ended
 
March
 
June
 
September
 
December
 
(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
)
Net loss available to common stockholders
$
(4,661
)
 
$
(8,714
)
 
$
(9,011
)
 
$
(10,317
)
Net loss per share, basic and diluted
$
(0.18
)
 
$
(0.29
)
 
$
(0.29
)
 
$
(0.33
)

The tables below summarize the Company’s unaudited quarterly operating results for the year ended December 31, 2017:
 
For the Quarters Ended
 
March
 
June
 
September
 
December
 
(in thousands)
Revenue
$
462

 
$
718

 
$
1,631

 
$
1,192

Research and development expenses
(4,120
)
 
(5,487
)
 
(5,018
)
 
(4,998
)
General and administrative expenses
(3,281
)
 
(2,581
)
 
(2,502
)
 
(2,548
)
Other income (expense), net
$
(41
)
 
$
38

 
$
55

 
$
(32
)
Net loss
$
(6,980
)
 
$
(7,312
)
 
$
(5,834
)
 
$
(6,386
)
Net loss available to common stockholders
$
(6,985
)
 
$
(7,312
)
 
$
(5,834
)
 
$
(6,386
)
Net loss per share, basic and diluted
$
(0.60
)
 
$
(0.34
)
 
$
(0.27
)
 
$
(0.29
)