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Financial instruments (Details 4) | Dec. 31, 2019 USD ($) Numbers | Dec. 31, 2018 USD ($) Numbers
--- | --- | ---
Financial instruments [Line Items] |  |
Total Gross Book Value | $ 399,142,000 | $ 466,619,000
Credit exposure | 16,192 | 14,756
Financial assets | $ 485,689,000 | $ 1,397,602,000
Uncollateralized Portfolio [Member] |  |
Financial instruments [Line Items] |  |
Number of customers under no renegotiated terms | Numbers | 1,861 | 4,834
Portfolio under no renegotiated terms | $ 381,049,000 | $ 442,340,000
Number of customers under renegotiated terms | Numbers | 304 | 1,232
Portfolio under renegotiated terms, gross | $ 2,726,000 | $ 3,330,000
Receivables due from related parties, current [Member] |  |
Financial instruments [Line Items] |  |
Financial assets | $ 11,323,000 | $ 55,520,000
Between 1 and 30 days [Member] |  |
Financial instruments [Line Items] |  |
Expected credit loss rate | 18.00% | 9.00%
Total Gross Book Value | $ 20,721,000 | $ 20,018,000
Credit exposure | $ 3,664 | $ 1,858
Between 1 and 30 days [Member] | Uncollateralized Portfolio [Member] |  |
Financial instruments [Line Items] |  |
Number of customers under no renegotiated terms | Numbers | 166 | 1,229
Portfolio under no renegotiated terms | $ 20,195,000 | $ 19,422,000
Number of customers under renegotiated terms | Numbers | 72 | 390
Portfolio under renegotiated terms, gross | $ 526,000 | $ 596,000
Between 31 and 60 days [member] |  |
Financial instruments [Line Items] |  |
Expected credit loss rate | 34.00% | 5.00%
Total Gross Book Value | $ 1,288,000 | $ 2,861,000
Credit exposure | $ 440 | $ 146
Between 31 and 60 days [member] | Uncollateralized Portfolio [Member] |  |
Financial instruments [Line Items] |  |
Number of customers under no renegotiated terms | Numbers | 26 | 801
Portfolio under no renegotiated terms | $ 1,279,000 | $ 5,705,000
Number of customers under renegotiated terms | Numbers | 4 | 154
Portfolio under renegotiated terms, gross | $ 10,000 | $ 118,000
Between 61 and 90 days [member] |  |
Financial instruments [Line Items] |  |
Expected credit loss rate | 44.00% | 4.00%
Total Gross Book Value | $ 573,000 | $ 2,354,000
Credit exposure | $ 251 | $ 89
Between 61 and 90 days [member] | Uncollateralized Portfolio [Member] |  |
Financial instruments [Line Items] |  |
Number of customers under no renegotiated terms | Numbers | 12 | 648
Portfolio under no renegotiated terms | $ 519,000 | $ 2,279,000
Number of customers under renegotiated terms | Numbers | 3 | 41
Portfolio under renegotiated terms, gross | $ 54,000 | $ 75,000
More than 91 days [member] |  |
Financial instruments [Line Items] |  |
Expected credit loss rate | 78.00% | 65.00%
Total Gross Book Value | $ 8,370,000 | $ 12,137,000
Credit exposure | $ 6,552 | $ 7,852
Between 121 and 150 days [member] | Uncollateralized Portfolio [Member] |  |
Financial instruments [Line Items] |  |
Number of customers under no renegotiated terms | Numbers | 5 | 80
Portfolio under no renegotiated terms | $ 361,000 | $ 423,000
Number of customers under renegotiated terms | Numbers | 7 | 16
Portfolio under renegotiated terms, gross | $ 49,000 | $ 29,000
Between 151 and 180 days [member] | Uncollateralized Portfolio [Member] |  |
Financial instruments [Line Items] |  |
Number of customers under no renegotiated terms | Numbers | 7 | 43
Portfolio under no renegotiated terms | $ 190,000 | $ 186,000
Number of customers under renegotiated terms | Numbers | 2 | 21
Portfolio under renegotiated terms, gross | $ 33,000 | $ 176,000
Between 181 and 210 days [member] | Uncollateralized Portfolio [Member] |  |
Financial instruments [Line Items] |  |
Number of customers under no renegotiated terms | Numbers | 4 | 7
Portfolio under no renegotiated terms | $ 51,000 | $ 1,291,000
Number of customers under renegotiated terms | Numbers | 0 | 41
Portfolio under renegotiated terms, gross | $ 0 | $ 231,000
Between 211 and 250 days [member] | Uncollateralized Portfolio [Member] |  |
Financial instruments [Line Items] |  |
Number of customers under no renegotiated terms | Numbers | 6 | 7
Portfolio under no renegotiated terms | $ 48,000 | $ 108,000
Number of customers under renegotiated terms | Numbers | 8 | 101
Portfolio under renegotiated terms, gross | $ 11,000 | $ 242,000
More than 250 days [member] | Uncollateralized Portfolio [Member] |  |
Financial instruments [Line Items] |  |
Number of customers under no renegotiated terms | Numbers | 144 | 140
Portfolio under no renegotiated terms | $ 5,449,000 | $ 7,036,000
Number of customers under renegotiated terms | Numbers | 137 | 305
Portfolio under renegotiated terms, gross | $ 1,085,000 | $ 1,148,000
Current [member] |  |
Financial instruments [Line Items] |  |
Expected credit loss rate | 1.00% | 1.00%
Total Gross Book Value | $ 352,823,000 | $ 408,300,000
Credit exposure | $ 5,285 | $ 4,811
Current [member] | Uncollateralized Portfolio [Member] |  |
Financial instruments [Line Items] |  |
Number of customers under no renegotiated terms | Numbers | 1,486 | 1,390
Portfolio under no renegotiated terms | $ 351,931,000 | $ 404,670,000
Number of customers under renegotiated terms | Numbers | 69 | 136
Portfolio under renegotiated terms, gross | $ 892,000 | $ 668,000
Between 91 and 120 days [member] | Uncollateralized Portfolio [Member] |  |
Financial instruments [Line Items] |  |
Number of customers under no renegotiated terms | Numbers | 5 | 489
Portfolio under no renegotiated terms | $ 1,026,000 | $ 1,220,000
Number of customers under renegotiated terms | Numbers | 2 | 27
Portfolio under renegotiated terms, gross | $ 66,000 | $ 47,000

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