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Share-based compensation (Tables)
 9 Months Ended
Sep. 30, 2020
Statement [LineItems]  
Summary of Weighted Average Assumptions of RPSU Plan Units Under Equity Method
The fair value and weighted average assumptions of the RSU plan units granted during the nine-month periods were as follows:
 
   Nine months ended September 30 
   
2020
  2019 
Average fair value of units granted (per unit)
  
$
0.55
 
 $2.77 
Expected life of units (years)
  
 
3.0
 
  3.0 
Expected forfeiture rate
  
 
0.6
% 
  1.0% 
  
 
 
  
 
 
 
Summary of Stock Option Activity and Related Information
   
Nine months ended

September 30, 2020
   Year ended
December 31, 2019		 
Options
  
Number of

Options
   
Weighted
Average

Exercise Price
   Number of
Options		   Weighted
Average
Exercise Price		 
Outstanding, beginning of period
  
 
89,178
 
  
$
10.41
 
   287,996   $25.34 
Granted
  
 
917,490
 
  
 
0.56
 
   —      —   
Forfeited
  
 
(44,714
) 
  
 
12.06
 
   (198,818)    32.04 
  
 
 
   
 
 
   
 
 
   
 
 
 
Outstanding, end of period
  
 
961,954
 
  
$
0.94
 
   89,178   $10.41 
  
 
 
   
 
 
   
 
 
   
 
 
 
Exercisable, end of period
  
 
44,464
 
  
$
8.74
 
   77,066   $10.67 
  
 
 
   
 
 
   
 
 
   
 
 
 
Summary of Weighted Average Assumptions of Options Granted
The fair value and weighted average assumptions of the options granted during the nine-month periods were as follows:
 
   Nine months ended September 30 
   
2020
  2019 
Average fair value of options granted (per option)
  
$
0.29
 
 $—   
Expected life of options (years)
  
 
2.2
 
  —   
Expected forfeiture rate
  
 
1.0
% 
  —   
  
 
 
  
 
 
 
Summary of Share-Based Compensation
Share-based compensation consisted of the following:
 
   Nine months ended September 30 
   
2020
   2019 
RSU grants
  
$
2
 
  $3 
  
 
 
   
 
 
 
Share-based compensation
  
$
2
 
  $3 
  
 
 
   
 
 
 
Restricted share unit plan [member]  
Statement [LineItems]  
Summary of Restricted and Performance Share Unit plan ("RPSU plan")
RSU plan
(number of shares equivalent)
  
Nine months ended

September 30, 2020
   Year ended
December 31, 2019		 
Outstanding, beginning of period
  
 
1,100,278
 
   1,235,202 
Granted
  
 
1,818,840
 
   971,916 
Vested
  
 
(507,565
) 
   (574,706) 
Forfeited
  
 
(36,244
) 
   (532,134) 
  
 
 
   
 
 
 
Outstanding, end of period
  
 
2,375,309
 
   1,100,278 
  
 
 
   
 
 
 
PSU Plan [member] | Options granted from June 2017 [member]  
Statement [LineItems]  
Summary of Restricted and Performance Share Unit plan ("RPSU plan")
PSU awards (number of shares equivalent)
  
Nine months ended

September 30, 2020
   Year ended
December 31, 2019		 
Outstanding, beginning of period
  
 
92,424
 
   163,129 
Granted
  
 
376,310
 
   144,211 
Vested
  
 
—  
 
   (22,929) 
Forfeited
  
 
(4,173
) 
   (191,987) 
  
 
 
   
 
 
 
Outstanding, end of period
  
 
464,561
 
   92,424