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Selected Quarterly Financial Data (Unaudited)
 12 Months Ended
Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]  
Selected Quarterly Financial Data (Unaudited) Selected Quarterly Financial Data (Unaudited)
    
The following is a summary of the quarterly results of the Company for the years ended December 31, 2019 and 2018 (unaudited, in thousands, except for per share data):
 
Three Months Ended
 
Year Ended
 
3/31/19
 
6/30/19
 
9/30/19
 
12/31/19
 
December 31, 2019
License and collaboration revenues
$
1,244

 
$
577

 
$
988

 
$
526

 
$
3,335

Loss from operations
(42,758
)
  
(47,641
)
  
(57,059
)
  
(74,646
)
  
$
(222,104
)
Net loss
(40,912
)
 
(45,695
)
 
(54,273
)
 
(72,376
)
 
(213,256
)
Basic and diluted net loss per share
$
(1.17
)
 
$
(1.26
)
 
$
(1.38
)
 
$
(1.83
)
 
$
(5.69
)
 

Three Months Ended
 
Year Ended
 
3/31/18
 
6/30/18
 
9/30/18
 
12/31/18
 
December 31, 2018
License and collaboration revenues
$
9,467

 
$
—

 
$
—

 
$
3,459

 
$
12,926

Loss from operations
(15,346
)
  
(28,670
)
  
(28,939
)
  
(29,672
)
  
(102,627
)
Net loss
(14,709
)
 
(27,869
)
 
(27,568
)
 
(28,272
)
 
(98,418
)
Basic and diluted net loss per share
$
(0.51
)
 
$
(0.94
)
 
$
(0.85
)
 
$
(0.87
)
 
$
(3.19
)


Net loss per share is computed independently for each of the quarters presented. Therefore, the sum of the quarterly per-share calculations will not necessarily equal the annual per share calculation.