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19 Expenses and cost by nature (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Expenses And Cost By Nature      
Cost of services R$ (434,654) R$ (308,853) R$ (168,052)
General and administrative expenses (402,855) (239,120) (70,034)
Total (837,509) (547,973) (238,086)
Payroll (446,473) (324,252) (156,623)
Hospital and medical agreements (37,988) (16,429) (10,209)
Depreciation and amortization (108,744) (73,152) (9,078)
Rent (2,555) (4,494) (20,302)
Commercial expenses (1,488) (1,363) (362)
Utilities (5,892) (6,628) (2,701)
Maintenance (20,746) (8,658) (2,373)
Share-based compensation (32,610) (18,114) (2,161)
Tax expenses (5,326) (2,696) (828)
Pedagogical services (24,037) (6,271) (4,212)
Sales and marketing (16,873) (11,603) (3,532)
Allowance for doubtful accounts (32,081) (15,040) (7,714)
Travel expenses (4,550) (7,054) (1,816)
Consulting fees (31,276) (13,060) (7,245)
Other (66,870) (39,159) (8,930)
Total R$ (837,509) R$ (547,973) R$ (238,086)