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Other current assets (Tables) | 12 Months Ended
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Dec. 31, 2021
Other current assets |
Schedule of Other current assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, | ​ | December 31,
​ |  | 2021 |  | 2020
Advances against auction contracts | ​ | $ | 4,102 | ​ | $ | 6,487
Assets held for sale | ​ |  | 17,538 | ​ |  | —
Prepaid expenses and deposits | ​ |  | 41,955 | ​ |  | 20,787
Derivative financial asset | ​ | ​ | 751 | ​ | ​ | —
​ | ​ | $ | 64,346 | ​ | $ | 27,274
Summary of Assets held for sale | ​
​ | ​ | ​ | ​
​ | ​ | ​ | ​
Balance, December 31, 2019 |  | $ | 15,051
Reclassified from property, plant and equipment | ​ |  | (6,888)
Disposal | ​ |  | (8,163)
Balance, December 31, 2020 |  | $ | —
Reclassified from property, plant and equipment | ​ |  | 17,779
Disposal | ​ |  | (241)
Balance, December 31, 2021 | ​ | $ | 17,538

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