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Share-based payments (Tables)
12 Months Ended
Dec. 31, 2020
Text block [abstract]  
Summary of Terms and Conditions, Relating to the Grants of the Non-vested Stock Award under the Equity Compensation Plan

A summary of the terms and conditions, properly approved by the Compensation Committee of our Board of Directors, relating to the grants of the
non-vested
stock award under the equity compensation plan is as follows:

Grant date
  
Number of
instruments
 
  
Vesting conditions
  
Contractual
life
April, 2015
  
 
4,915
 
  
15% first three anniversaries
25% fourth
30% fifth anniversary
  
5 years
June, 2015
  
 
5,839
 
  
15% first three anniversaries
25% fourth
30% fifth anniversary
  
5 years
February, 2016
  
 
147,000
 
  
15% first three anniversaries
25% fourth
30% fifth anniversary
  
5 years
February, 2016
  
 
63,000
 
  
Fifth anniversary
  
5 years
May, 2016
  
 
7,899
 
  
15% first three anniversaries
25% fourth
30% fifth anniversary
  
5 years
February, 2017
  
 
22,012
 
  
One-third
every anniversary
  
3 years
February, 2017
  
 
11,980
 
  
One-third
every anniversary
  
3 years
February, 2017
  
 
2,237
 
  
Third anniversary
  
3 years
February, 2018
  
 
21,556
 
  
7% first month
31% first three anniversaries
  
3 years
February, 2018
  
 
14,379
 
  
33% first three anniversaries
  
3 years
February, 2018
  
 
1,316
 
  
15% first three anniversaries
25% fourth
30% fifth anniversary
  
5 years
July, 2018
  
 
6,104
 
  
Third anniversary
  
3 years
February, 2019
  
 
15,951
 
  
1% first month
33% first three anniversaries
  
3 years
June, 2019
  
 
9,256
 
  
33% first three anniversaries
  
3 years
June, 2019
  
 
977
 
  
33% first three anniversaries
  
3 years
August, 2019
  
 
1,039
 
  
33% first three anniversaries
  
3 years
December, 2019
  
 
1,724
 
  
100% first anniversary
  
1 year
February, 2020
  
 
24,650
 
  
1% first month
33% first three anniversaries
  
3 years
December, 2020
  
 
3,551
 
  
100% first anniversary
  
1 year
Summary of Non-vested Stock Award Activity
A summary of the
non-vested
stock award activity under the plan as of December 31, 2020, 2019 and 2018 with changes during these years is as follows (in number of shares):

 
  
2020
 
 
2019
 
 
2018
 
Non-vested
as of January 1
  
 
211,205
 
 
 
271,904
 
 
 
304,153
 
Granted
  
 
28,201
 
 
 
28,947
 
 
 
43,355
 
Vested
  
 
(83,409
 
 
(80,170
 
 
(72,045
Forfeited
  
 
(2,076
 
 
(9,476
 
 
(3,559
 
  
 
 
 
 
 
 
 
 
 
 
 
Non-vested
as of December 31
  
 
153,921
 
 
 
211,205
 
 
 
271,904