Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept |
As at 2021-12-31 |
As at 2020-12-31 |
As at 2019-12-31 |
As at 2018-12-31 |
|---|---|---|---|---|
| Subclassifications of assets, liabilities and equities [abstract] | ||||
| Property, plant and equipment [abstract] | ||||
| Property, plant and equipment |
26,771,000
USD
|
22,777,000
USD
|
— | — |
| Intangible assets and goodwill [abstract] | ||||
| Intangible assets other than goodwill [abstract] | ||||
| Intangible assets other than goodwill |
987,000
USD
|
899,000
USD
|
— | — |
| Investments in subsidiaries, joint ventures and associates reported in separate financial statements [abstract] | ||||
| Investments in associates reported in separate financial statements |
—
USD
|
—
USD
|
— | — |
| Miscellaneous non-current assets [abstract] | ||||
| Non-current finance lease receivables |
1,285,000
USD
|
1,700,000
USD
|
— | — |
| Other non-current assets |
810,000
USD
|
11,000
USD
|
— | — |
| Trade and other current receivables [abstract] | ||||
| Current receivables due from related parties | — | — | — | — |
| Current receivables due from associates |
15,120,000
USD
|
—
USD
|
— | — |
| Current prepayments and current accrued income other than current contract assets [abstract] | ||||
| Current prepayments [abstract] | ||||
| Current prepaid expenses |
10,755,000
USD
|
5,405,000
USD
|
— | — |
| Trade and other current receivables |
3,174,000
USD
|
2,558,000
USD
|
— | — |
| Current prepayments and current accrued income including current contract assets [abstract] | ||||
| Categories of non-current financial assets [abstract] | ||||
| Non-current financial assets at fair value through profit or loss [abstract] | ||||
| Non-current financial assets at fair value through profit or loss |
397,179,000
USD
|
530,161,000
USD
|
— | — |
| Cash and cash equivalents [abstract] | ||||
| Cash and cash equivalents |
465,708,000
USD
|
403,881,000
USD
|
132,360,000
USD
|
117,051,000
USD
|
| Miscellaneous current assets [abstract] | ||||
| Current finance lease receivables |
415,000
USD
|
381,000
USD
|
— | — |
| Miscellaneous assets [abstract] | ||||
| Restricted cash and cash equivalents |
2,124,000
USD
|
2,124,000
USD
|
— | — |
| Borrowings [abstract] | ||||
| Non-current portion of non-current borrowings |
14,261,000
USD
|
14,818,000
USD
|
— | — |
| Current borrowings and current portion of non-current borrowings [abstract] | ||||
| Current portion of non-current borrowings |
857,000
USD
|
—
USD
|
— | — |
| Non-current portion of non-current borrowings, by type [abstract] | ||||
| Borrowings, by type [abstract] | ||||
| Notes and debentures issued |
3,916,000
USD
|
26,455,000
USD
|
— | — |
| Trade and other current payables [abstract] | ||||
| Current accruals and current deferred income including current contract liabilities [abstract] | ||||
| Current deferred income including current contract liabilities [abstract] | ||||
| Current contract liabilities [abstract] | ||||
| Current contract liabilities |
65,000
USD
|
1,472,000
USD
|
— | — |
| Trade and other current payables |
35,817,000
USD
|
21,826,000
USD
|
— | — |
| Miscellaneous current liabilities [abstract] | ||||
| Current derivative financial liabilities |
6,787,000
USD
|
8,206,000
USD
|
— | — |
| Other current liabilities |
726,000
USD
|
732,000
USD
|
— | — |
| Issued capital [abstract] | ||||
| Issued capital |
5,444,000
USD
|
5,417,000
USD
|
— | — |
| Retained earnings [abstract] | ||||
| Retained earnings |
199,871,000
USD
|
260,429,000
USD
|
— | — |
| Accumulated other comprehensive income [abstract] | ||||
| Reserve of exchange differences on translation |
469,000
USD
|
469,000
USD
|
— | — |
| Miscellaneous equity [abstract] | ||||
| Merger reserve |
138,506,000
USD
|
138,506,000
USD
|
— | — |
| Net assets (liabilities) [abstract] | ||||
| Assets |
946,006,000
USD
|
989,994,000
USD
|
— | — |
| Liabilities |
361,859,000
USD
|
336,455,000
USD
|
— | — |
| Net current assets (liabilities) [abstract] | ||||
| Current assets |
501,809,000
USD
|
414,348,000
USD
|
— | — |
| Current liabilities |
226,135,000
USD
|
180,924,000
USD
|
— | — |
| Assets less current liabilities [abstract] |