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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

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