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Selected Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]  
Unaudited Selected Quarterly Financial Data
The following tables provide the unaudited selected quarterly financial data for the years ended December 31, 2019 and 2018 (in thousands, except per share data). We believe that the following information reflects all normal recurring adjustments necessary for a fair statement of the information for the periods presented. The operating results for any quarter are not necessarily indicative of results of any future period.

 
 
 
 
 
 
 
 
 
 
 
2019
 
 
First
 Quarter (1)
 
Second Quarter (1)
 
Third
Quarter (1)
 
Fourth
Quarter
Total revenue
 
$
16,025

 
$
13,083

 
$
17,046

 
$
14,055

Total operating expenses
 
157,665

 
156,792

 
146,861

 
144,611

Loss from operations
 
(141,640
)
 
(143,709
)
 
(129,815
)
 
(130,556
)
Net loss per share attributable to common stockholders - basic and diluted
 
$
(0.40
)
 
$
(0.41
)
 
$
(0.37
)
 
$
(0.37
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2018
 
 
First
Quarter
 
Second Quarter
 
Third
Quarter
 
Fourth
Quarter
Total revenue
 
$
29,039

 
$
28,851

 
$
41,757

 
$
35,421

Total operating expenses
 
106,441

 
125,866

 
127,575

 
188,452

Loss from operations
 
(77,402
)
 
(97,015
)
 
(85,818
)
 
(153,031
)
Net loss per share attributable to common stockholders - basic and diluted
 
$
(1.16
)
 
$
(1.43
)
 
$
(1.32
)
 
$
(1.14
)

_______
(1) As a result of our adoption of ASC 842 as of January 1, 2019 (Note 2), quarterly amounts presented in our prior Forms 10-Q were revised. Total operating expenses and Loss from operations were both adjusted by $0.2 million, $0.2 million and $1.0 million, for the first, second and third quarters of 2019, respectively.