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Cost of sales, without considering depreciation and amortization (Details 1) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of cost of sales [Line Items]      
Other production expenses $ 13,595 $ 15,028 $ 24,107,000
Cost of sales of services, without considering depreciation and amortization (4,318) (12,954) (10,754)
cost of services [Member]      
Disclosure of cost of sales [Line Items]      
Direct labor 2,128 7,398 5,983
Consumption of materials and supplies 675 1,026 868
Maintenance and repair 543 946 217
Services provided by third parties 382 1,782 1,689
Electricity and water 249 586 633
Rentals 92 423 480
Insurances 86 246 212
Transport 50 98 213
Other production expenses 113 449 459
Cost of sales of services, without considering depreciation and amortization $ 4,318 $ 12,954 $ 10,754