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Share-based payment - Changes in activities of the options (Details)
R$ / shares in Units, R$ in Thousands
 12 Months Ended
Jul. 09, 2020
USD ($)
R$ / shares
Feb. 15, 2018
USD ($)
R$ / shares
Sep. 30, 2016
USD ($)
R$ / shares
Feb. 24, 2012
USD ($)
R$ / shares
Dec. 31, 2021
BRL (R$)
USD ($)
R$ / shares
Dec. 31, 2020
BRL (R$)
USD ($)
R$ / shares
Dec. 31, 2019
USD ($)
R$ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Opening Balance, Shares         41,759,010 31,938,120 143,603,848
Granted, Shares         4,762,800 17,858,700 900,000
Expired/Cancelled, Shares         2,266,200 929,322 804,240
Exercised, Shares         7,654,320 7,108,488 11,761,488
Final Balance, Shares         36,601,290 41,759,010 31,938,120
Opening Balance, Weighted average price of the shares | R$ / shares         R$ 1.46 R$ 0.29 R$ 0.26
Granted, Weighted average price of the shares | R$ / shares         4.06 3.06 0.27
Expired/Cancelled, Weighted average price of the shares | R$ / shares         0.50 0.26 0.24
Exercised, Weighted average price of the shares | R$ / shares         0.91 0.26 0.26
Final Balance, Weighted average price of the shares | R$ / shares         R$ 2.39 R$ 1.46 R$ 0.29
Number of Shares Exercised         7,654,320 7,108,488 11,761,488
Plan 2              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Quantity of Employees           1 12
Opening Balance, Shares           431,046 4,325,184
Granted, Shares       30,590,460      
Expired/Cancelled, Shares             278,640
Exercised, Shares           431,046 3,615,498
Final Balance, Shares             431,046
Granted, Weighted average price of the shares | R$ / shares       R$ 0.21      
Number of Shares Exercised           431,046 3,615,498
Share plan expense in exercise | R$           R$ 0  
Remaining Remuneration Cost Period (in years)           0 years  
Remaining Contractual Life (in years)           0 years  
Plan 3              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Quantity of Employees         3 16 18
Opening Balance, Shares         7,128,000 8,839,800 9,736,200
Granted, Shares     10,584,000   648,000    
Expired/Cancelled, Shares           91,800 136,800
Exercised, Shares         3,715,200 1,620,000 759,600
Final Balance, Shares         4,060,800 7,128,000 8,839,800
Granted, Weighted average price of the shares | R$ / shares     R$ 0.26        
Number of Shares Exercised         3,715,200 1,620,000 759,600
Number of Exercisable Shares         4,060,800 468,000  
Share plan expense in exercise | R$           R$ 48  
Share plan expense to be Recognized | R$           R$ 48  
Remaining Remuneration Cost Period (in years)         0 years 6 months  
Remaining Contractual Life (in years)         2 years 3 years 7 months 6 days  
Plan 4 (tranche 1)              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Quantity of Employees         31 33 25
Opening Balance, Shares         19,652,310 22,667,274 129,542,464
Granted, Shares   32,714,784       2,880,000 900,000
Expired/Cancelled, Shares         2,131,200 837,522 388,800
Exercised, Shares         2,772,720 5,057,442 7,386,390
Final Balance, Shares         14,748,390 19,652,310 22,667,274
Granted, Weighted average price of the shares | R$ / shares   R$ 0.21          
Number of Shares Exercised         2,772,720 5,057,442 7,386,390
Number of Exercisable Shares         14,748,390 1,149,795  
Share plan expense in exercise | R$           R$ 0  
Remaining Remuneration Cost Period (in years)         0 years 4 years  
Remaining Contractual Life (in years)         3 years 2 months 12 days 4 years 8 months 12 days  
Plan 4 (tranche 2)              
Disclosure of terms and conditions of share-based payment arrangement [line items]              
Quantity of Employees         59 59  
Opening Balance, Shares         14,978,700    
Granted, Shares 19,093,500       4,114,800 14,978,700  
Expired/Cancelled, Shares         135,000    
Exercised, Shares         1,166,400    
Final Balance, Shares         17,792,100 14,978,700  
Granted, Weighted average price of the shares | R$ / shares R$ 3.60            
Number of Shares Exercised         1,166,400    
Number of Exercisable Shares         17,792,100    
Share plan expense in exercise | R$         R$ 3,089    
Share plan expense to be Recognized | R$         R$ 16,924    
Remaining Remuneration Cost Period (in years)         4 years    
Remaining Contractual Life (in years)         6 years 1 month 6 days