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Cost of sales, without considering depreciation and amortization - Cost of services (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of cost of sales [Line Items]      
Cost of sales of services, without considering depreciation and amortization $ 1,554 $ 3,378 $ 4,318
cost of services [Member]      
Disclosure of cost of sales [Line Items]      
Disbursement of salaries 371 1,231 2,128
Consumption of materials and supplies 20 497 675
Maintenance and repair 55 186 543
Services provided by third parties 189 331 382
Electricity and water 668 589 249
Insurances 81 163 86
Transport 87 148 50
Short-term and low-value lease 6 89 92
Other production expenses 77 144 113
Cost of sales of services, without considering depreciation and amortization $ 1,554 $ 3,378 $ 4,318