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Selected Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]  
Summary of Selected Quarterly Financial Data
Selected quarterly financial data (unaudited) for the year ended December 31, 2018 and 2017 is presented below:
 
Quarter Ended (Unaudited)

March 31,

June 30,

September 30,

December 31,
2018







Total revenues*
$
30,495


$
24,168


$
25,268


$
29,402

Loss from Operations
$
(25,264
)

$
(34,311
)

$
(29,024
)

$
(42,578
)
Net (loss) income
$
(15,816
)

$
13,744


$
(68,718
)

$
(49,221
)
Net loss per share, basic and diluted
$
(0.16
)

$
0.13


$
(0.66
)

$
(0.47
)

* See Note 2(i) for a discussion of our adoption of Topic 606 effective beginning on January 1, 2018.

Quarter Ended (Unaudited)

March 31,

June 30,

September 30,

December 31,
2017







Total revenues
$
29,101


$
34,301


$
36,395


$
28,570

Loss from Operations
$
(21,909
)

$
(18,609
)

$
(15,054
)

$
(41,088
)
Net loss
$
(23,547
)

$
(20,852
)

$
(18,293
)

$
(28,556
)
Net loss per share, basic and diluted
$
(0.30
)

$
(0.27
)

$
(0.22
)

$
(0.29
)