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Quarterly Financial Data (unaudited)
 12 Months Ended
Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Financial Data (unaudited)
Quarterly Financial Data (unaudited)
The following table presents quarterly data for the years ended December 31, 2019 and 2018, in thousands, except per share data:
 
2019
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
 
Full Year
Revenues
$
1,445

 
$
4,262

 
$
(361
)
 
$
287

 
$
5,633

Loss from operations
(13,260
)
 
(9,901
)
 
(12,342
)
 
(9,985
)
 
(45,488
)
Net loss
(12,956
)
 
(9,688
)
 
(12,015
)
 
(9,923
)
 
(44,582
)
Basic and diluted net loss per common share (1)
$
(0.09
)
 
$
(0.06
)
 
$
(0.08
)
 
$
(0.06
)
 
$
(0.29
)
 
2018
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
 
Full Year
Revenues
$
1,066

 
$
19,391

 
$
2,321

 
$
1,513

 
$
24,291

Income (loss) from operations
(10,262
)
 
6,745

 
(9,976
)
 
(11,552
)
 
(25,045
)
Net income (loss)
(10,155
)
 
6,933

 
(9,740
)
 
(11,321
)
 
(24,283
)
Basic and diluted net income (loss) per common share (1)
$
(0.08
)
 
$
0.05

 
$
(0.07
)
 
$
(0.08
)
 
$
(0.18
)

(1) Due to the effect of quarterly changes to outstanding shares of common stock and weightings, the annual loss per share will not necessarily equal the sum of the respective quarters.