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Property and equipment (Details 2) (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Changes in cost and accumulated depreciation were as follows    
Net book value R$ 67,104 R$ 10,889
Cost    
Changes in cost and accumulated depreciation were as follows    
Purchases 61,575  
Disposals (15)  
Acquisition of subsidiary 440  
Depreciation (5,785)  
Net book value 78,607 16,607
Accumulated amortization    
Changes in cost and accumulated depreciation were as follows    
Net book value (11,503) (5,718)
Data processing equipment    
Changes in cost and accumulated depreciation were as follows    
Net book value 15,519 5,910
Data processing equipment | Cost    
Changes in cost and accumulated depreciation were as follows    
Purchases 12,310  
Depreciation (2,701)  
Net book value 23,334 11,024
Data processing equipment | Accumulated amortization    
Changes in cost and accumulated depreciation were as follows    
Net book value (7,815) (5,114)
Facilities    
Changes in cost and accumulated depreciation were as follows    
Net book value 11 30
Facilities | Cost    
Changes in cost and accumulated depreciation were as follows    
Disposals (15)  
Depreciation (4)  
Net book value 38 53
Facilities | Accumulated amortization    
Changes in cost and accumulated depreciation were as follows    
Net book value (27) (23)
Machinery and equipment    
Changes in cost and accumulated depreciation were as follows    
Net book value 41,661 4,294
Machinery and equipment | Cost    
Changes in cost and accumulated depreciation were as follows    
Purchases 40,019  
Depreciation (2,652)  
Net book value 44,757 4,738
Machinery and equipment | Accumulated amortization    
Changes in cost and accumulated depreciation were as follows    
Net book value (3,096) (444)
Furniture and fittings    
Changes in cost and accumulated depreciation were as follows    
Net book value 2,005 331
Furniture and fittings | Cost    
Changes in cost and accumulated depreciation were as follows    
Purchases 1,667  
Acquisition of subsidiary 89  
Depreciation (82)  
Net book value 2,153 397
Furniture and fittings | Accumulated amortization    
Changes in cost and accumulated depreciation were as follows    
Net book value (148) (66)
Building improvements [member]    
Changes in cost and accumulated depreciation were as follows    
Net book value 6,759 234
Building improvements [member] | Cost    
Changes in cost and accumulated depreciation were as follows    
Purchases 6,341  
Acquisition of subsidiary 351  
Depreciation (166)  
Net book value 6,954 263
Building improvements [member] | Accumulated amortization    
Changes in cost and accumulated depreciation were as follows    
Net book value (195) (29)
Vehicles    
Changes in cost and accumulated depreciation were as follows    
Net book value 1,149 90
Vehicles | Cost    
Changes in cost and accumulated depreciation were as follows    
Purchases 1,238  
Depreciation (180)  
Net book value 1,371 132
Vehicles | Accumulated amortization    
Changes in cost and accumulated depreciation were as follows    
Net book value R$ (222) R$ (42)