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Property and equipment (Details 2) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Changes in cost and accumulated depreciation were as follows    
Purchases R$ 7,873  
Acquisition of subsidiary 271  
Depreciation (1,812)  
Net book value 10,889 R$ 4,558
Cost    
Changes in cost and accumulated depreciation were as follows    
Net book value 16,607 8,464
Accumulated amortization    
Changes in cost and accumulated depreciation were as follows    
Net book value (5,718) (3,906)
Data processing equipment    
Changes in cost and accumulated depreciation were as follows    
Opening balance 3,882  
Purchases 3,316  
Acquisition of subsidiary 134  
Depreciation (1,422)  
Net book value 5,910 3,882
Data processing equipment | Cost    
Changes in cost and accumulated depreciation were as follows    
Net book value 11,024 7,574
Data processing equipment | Accumulated amortization    
Changes in cost and accumulated depreciation were as follows    
Net book value (5,114) (3,692)
Facilities    
Changes in cost and accumulated depreciation were as follows    
Opening balance 33  
Purchases 1  
Depreciation (4)  
Net book value 30 33
Facilities | Cost    
Changes in cost and accumulated depreciation were as follows    
Net book value 53 52
Facilities | Accumulated amortization    
Changes in cost and accumulated depreciation were as follows    
Net book value (23) (19)
Machinery and equipment    
Changes in cost and accumulated depreciation were as follows    
Opening balance 408  
Purchases 4,171  
Acquisition of subsidiary 19  
Depreciation (304)  
Net book value 4,294 408
Machinery and equipment | Cost    
Changes in cost and accumulated depreciation were as follows    
Net book value 4,738 548
Machinery and equipment | Accumulated amortization    
Changes in cost and accumulated depreciation were as follows    
Net book value (444) (140)
Furniture and fittings    
Changes in cost and accumulated depreciation were as follows    
Opening balance 150  
Purchases 176  
Acquisition of subsidiary 31  
Depreciation (26)  
Net book value 331 150
Furniture and fittings | Cost    
Changes in cost and accumulated depreciation were as follows    
Net book value 397 190
Furniture and fittings | Accumulated amortization    
Changes in cost and accumulated depreciation were as follows    
Net book value (66) (40)
Leasehold improvements    
Changes in cost and accumulated depreciation were as follows    
Opening balance 85  
Purchases 94  
Acquisition of subsidiary 69  
Depreciation (14)  
Net book value 234 85
Leasehold improvements | Cost    
Changes in cost and accumulated depreciation were as follows    
Net book value 263 100
Leasehold improvements | Accumulated amortization    
Changes in cost and accumulated depreciation were as follows    
Net book value (29) R$ (15)
Vehicles    
Changes in cost and accumulated depreciation were as follows    
Purchases 114  
Acquisition of subsidiary 18  
Depreciation (42)  
Net book value 90  
Vehicles | Cost    
Changes in cost and accumulated depreciation were as follows    
Net book value 132  
Vehicles | Accumulated amortization    
Changes in cost and accumulated depreciation were as follows    
Net book value R$ (42)