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Share-based payment (Schedule of Share-based Payment) (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 USD ($) item | Dec. 31, 2020 USD ($) item | Dec. 31, 2019 USD ($)
Disclosure Of Share-based Payment [Line Items] |  |  |
Number of share options outstanding in share-based payment arrangement | 939,675 |  |
Number of share options granted in share-based payment arrangement | 279,818 |  |
Number of share options forfeited in share-based payment arrangement | (466,390) |  |
Number of share options exercised in share-based payment arrangement | (168,708) |  |
Number of share options outstanding in share-based payment arrangement | 584,395 | 939,675 |
Expense from share-based payment transactions with employees | $ | $ 6,621 | $ 8,444 | $ 2,717
Shares granted to Non-Executive Director [Member] |  |  |
Disclosure Of Share-based Payment [Line Items] |  |  |
Number of share options outstanding in share-based payment arrangement | 0 |  |
Number of share options granted in share-based payment arrangement | 64,269 |  |
Number of share options forfeited in share-based payment arrangement | 0 |  |
Number of share options exercised in share-based payment arrangement | (64,269) |  |
Number of share options outstanding in share-based payment arrangement | 0 | 0 |
Expense from share-based payment transactions with employees | $ | $ 861 | $ 665 | 500
Executive Directors' Bonus [Member] |  |  |
Disclosure Of Share-based Payment [Line Items] |  |  |
Number of share options outstanding in share-based payment arrangement | 156,497 |  |
Number of share options granted in share-based payment arrangement | 118,272 |  |
Number of share options forfeited in share-based payment arrangement | 0 |  |
Number of share options exercised in share-based payment arrangement | (104,439) |  |
Number of share options outstanding in share-based payment arrangement | 170,330 | 156,497 |
Expense from share-based payment transactions with employees | $ | $ 800 | $ 800 | 800
VCP 2019 [Member] |  |  |
Disclosure Of Share-based Payment [Line Items] |  |  |
Number of share options outstanding in share-based payment arrangement | 378,053 |  |
Number of share options granted in share-based payment arrangement | 0 |  |
Number of share options forfeited in share-based payment arrangement | (378,053) |  |
Number of share options exercised in share-based payment arrangement | 0 |  |
Number of share options outstanding in share-based payment arrangement | 0 | 378,053 |
Expense from share-based payment transactions with employees | $ | $ 4,098 | $ 5,705 | 951
Year of issuance 2020 [Member] |  |  |
Disclosure Of Share-based Payment [Line Items] |  |  |
Number of share options outstanding in share-based payment arrangement | 405,125 |  |
Number of share options granted in share-based payment arrangement | 97,277 |  |
Number of share options forfeited in share-based payment arrangement | (88,337) |  |
Number of share options exercised in share-based payment arrangement | 0 |  |
Number of share options outstanding in share-based payment arrangement | 414,065 | 405,125 |
Expense from share-based payment transactions with employees | $ | $ 862 | $ 1,274 | 0
Year of Issuance 2018 [Member] |  |  |
Disclosure Of Share-based Payment [Line Items] |  |  |
Number of share options outstanding in share-based payment arrangement | 0 |  |
Number of share options granted in share-based payment arrangement | 0 |  |
Number of share options forfeited in share-based payment arrangement | 0 |  |
Number of share options exercised in share-based payment arrangement | 0 |  |
Number of share options outstanding in share-based payment arrangement | 0 | 0 |
Expense from share-based payment transactions with employees | $ | $ 0 | $ 0 | 416
Year of issuance 2016 [Member] |  |  |
Disclosure Of Share-based Payment [Line Items] |  |  |
Number of share options outstanding in share-based payment arrangement | 0 |  |
Number of share options granted in share-based payment arrangement | 0 |  |
Number of share options forfeited in share-based payment arrangement | 0 |  |
Number of share options exercised in share-based payment arrangement | 0 |  |
Number of share options outstanding in share-based payment arrangement | 0 | 0 |
Expense from share-based payment transactions with employees | $ | $ 0 | $ 0 | 50
Issuance [Member] |  |  |
Disclosure Of Share-based Payment [Line Items] |  |  |
Number of share options outstanding in share-based payment arrangement | 405,125 |  |
Number of share options granted in share-based payment arrangement | 97,277 |  |
Number of share options forfeited in share-based payment arrangement | (88,337) |  |
Number of share options exercised in share-based payment arrangement | 0 |  |
Number of share options outstanding in share-based payment arrangement | 414,065 | 405,125 |
Expense from share-based payment transactions with employees | $ | $ 862 | $ 1,274 | $ 466

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