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Selected Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]  
Summary of Quarterly Financial Information
The following table presents selected unaudited quarterly financial information for the years ended December 31, 2018 and 2017. The results for any quarter are not necessarily indicative of future quarterly results and, accordingly, period to period comparisons should not be relied upon as an indication of future performance.
 
FOR THE QUARTER ENDED
(in thousands, except per share amounts)
DECEMBER 31,
 
SEPTEMBER 30,
 
JUNE 30,
 
MARCH 31,
2018
 
 
 
 
 
 
 
Total revenues, net
$
14,456

 
$
7,302

 
$
2,423

 
$
—

Total costs and expenses
$
66,381

 
$
68,640

 
$
58,107

 
$
40,795

Net loss
$
(51,458
)
 
$
(85,388
)
 
$
(55,024
)
 
$
(40,699
)
Net loss per common share—basic and diluted
$
(1.14
)
 
$
(1.96
)
 
$
(1.40
)
 
$
(1.05
)
 
 
 
 
 
 
 
 
 
DECEMBER 31,
 
SEPTEMBER 30,
 
JUNE 30,
 
MARCH 31,
2017
 
 
 
 
 
 
 
Operating expenses
$
60,314

 
$
32,182

 
$
27,768

 
$
25,429

Net loss
$
(58,513
)
 
$
(32,372
)
 
$
(28,433
)
 
$
(25,787
)
Net loss per common share—basic and diluted
$
(1.60
)
 
$
(0.89
)
 
$
(0.82
)
 
$
(0.76
)