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Intangible assets, net - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Finite-Lived Intangible Assets [Line Items] |  |
Cost | $ 15,244 | $ 14,639
Amortization | (6,945) | (5,782)
Net book value | 8,299 | 8,857
Land use rights |  |
Finite-Lived Intangible Assets [Line Items] |  |
Cost | 5,218 | 5,099
Amortization | (1,461) | (1,258)
Net book value | 3,757 | 3,841
Acquired computer software |  |
Finite-Lived Intangible Assets [Line Items] |  |
Cost | 3,875 | 3,530
Amortization | (3,053) | (2,853)
Net book value | 822 | 677
Audio-visual license |  |
Finite-Lived Intangible Assets [Line Items] |  |
Cost | 6,151 | 6,010
Amortization | (2,431) | (1,671)
Net book value | $ 3,720 | $ 4,339

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