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Bank borrowings (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Debt Instrument [Line Items] |  |  |
Bank borrowings | $ 19,924,000 | $ 11,324,000 |
Net interest expense capitalized | $ 890,000 | $ 470,000 | $ 0
Minimum | Loan Prime Rate |  |  |
Debt Instrument [Line Items] |  |  |
Spread on variable basis rate | 15.00% |  |
Maximum | Loan Prime Rate |  |  |
Debt Instrument [Line Items] |  |  |
Spread on variable basis rate | 30.00% |  |

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