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Bank borrowings (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Debt Instrument [Line Items] |  |  |
Bank borrowings, current portion | $ 2,876,000 |  |
Bank borrowings, non-current portion | 17,291,000 | $ 19,924,000 |
Total | 20,167,000 | 19,924,000 |
Net interest expense capitalized | $ 1,000,000 | $ 890,000 | $ 470,000
Minimum | Loan Prime Rate |  |  |
Debt Instrument [Line Items] |  |  |
Spread on variable basis rate | 15.00% |  |

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