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Selected Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]  
Summary of Selected Quarterly Financial Data
Selected quarterly financial data (unaudited) for the year ended December 31, 2019 and 2018 is presented below:
 
Quarter Ended (Unaudited)

March 31,

June 30,

September 30,

December 31,
2019







Total revenues
$
—


$
—


$
—


$
—

Loss from continuing operations before other income (expense) and income taxes
$
(37,838
)

$
(34,212
)

$
(30,293
)

$
(38,355
)
Loss from continuing operations*
$
(39,846
)

$
(28,783
)

$
(26,557
)

$
(40,200
)
Basic and diluted loss per common share from continuing operations***
$
(0.36
)

$
(0.26
)

$
(0.24
)

$
(0.36
)


Quarter Ended (Unaudited)

March 31,

June 30,

September 30,

December 31,
2018







Total revenues
$
—


$
—


$
—


$
—

Loss from continuing operations before other income (expense) and income taxes
$
(29,981
)

$
(32,986
)

$
(28,422
)

$
(46,458
)
(Loss) income from continuing operations**
$
(19,243
)

$
14,863


$
(69,209
)

$
(53,117
)
Basic and diluted (loss) income per common share from continuing operations***
$
(0.19
)

$
0.14


$
(0.66
)

$
(0.52
)

* Loss from continuing operations for the quarter ended March 31, 2019 was adjusted by $26 thousand from amounts previously reported on Form 10-Q as a result of correcting the immaterial errors discussed in Note 15.  
** (Loss) income from continuing operations for each of the quarters ended March 31, June 30, September 30, and December 31, 2018 were adjusted by $71 thousand, $31 thousand, $37 thousand, and $38 thousand, respectively, from amounts previously reported on Form 10-Q as a result of correcting the immaterial errors discussed in Note 15.