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Unaudited quarterly financial data (Tables)
 12 Months Ended
Dec. 31, 2019
Unaudited quarterly financial data [Abstract]  
Quarterly Financial Data
Summarized quarterly financial data for the years ended December 31, 2019 and 2018 are as follows:

(in thousands of U.S. dollars, except per share data)
 
  
Three months ended
 
  
March 31,
2019
  
June 30,
2019
  
September 30,
2019
  
December 31,
2019
 
Revenues
 
$
29,951
  
$
39,766
  
$
49,656
  
$
69,752
 
Operating loss
  
(59,337
)
  
(43,959
)
  
(47,726
)
  
(36,253
)
Net loss
  
(60,292
)
  
(51,233
)
  
(54,424
)
  
(38,370
)
Net loss attributable to stockholders
  
(13,557
)
  
(6,186
)
  
(6,723
)
  
(7,343
)
Basic and diluted loss per share (1)
  
(0.96
)
  
(0.28
)
  
(0.30
)
  
(0.30
)

(1) Basic and diluted earnings per share are computed independently for each of the quarters presented. Therefore, the sum of quarterly basic and diluted per share information may not equal annual basic and diluted earnings per share.

 
 
Three months ended
 
 
 
March 31,
2018
  
June 30,
2018
  
September 30,
2018
  
December 31,
2018
 
 
            
Revenues
 
$
25,709
  
$
26,799
  
$
28,424
  
$
31,369
 
Operating loss
  
(9,465
)
  
(17,141
)
  
(9,922
)
  
(21,960
)
Net loss
  
(10,913
)
  
(18,825
)
  
(13,681
)
  
(34,763
)
Net loss attributable to stockholders
  
(10,913
)
  
(18,825
)
  
(13,609
)
  
(34,729
)