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Long-term debt (Details) | 12 Months Ended
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Dec. 31, 2021
Long-term debt (Details) [Line Items] |
Term loan agreement description | In 2013, the Company entered into a term loan agreement with a financial institution for $4.1 million with a maturity date of November 26, 2028 (the “Term Loan”).
Interest rate | 1.80%
One-year savings account plus [Member] |
Long-term debt (Details) [Line Items] |
Interest rate | 0.43%
Two-year savings account plus [Member] |
Long-term debt (Details) [Line Items] |
Interest rate | 0.61%
Remaining-year savings account plus [Member] |
Long-term debt (Details) [Line Items] |
Interest rate | 1.80%

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