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Short-term and long-term investments (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Investment Holdings [Line Items] |  |
Debt securities | $ 23,226 | $ 8,217
Equity securities, FV-NI | 48,598 | 44,077
Total | 71,824 | 52,294
Debt securities, short-term investments | 8,227 | 8,217
Total Short-term investments | 22,310 | 20,101
Debt securities, long-term investments | 14,999 | 0
Total Long-term investments | 49,514 | 32,193
Certificates of deposit and other time deposits |  |
Investment Holdings [Line Items] |  |
Debt securities | 23,226 | 8,217
Equity securities, FV-NI | 0 | 0
Total | 23,226 | 8,217
Investments in mutual funds and common stock |  |
Investment Holdings [Line Items] |  |
Debt securities | 0 | 0
Equity securities, FV-NI | 48,598 | 44,077
Total | 48,598 | 44,077
Short-term Investments |  |
Investment Holdings [Line Items] |  |
Equity securities, FV-NI | 14,083 | 11,884
Other long-term Investments |  |
Investment Holdings [Line Items] |  |
Equity securities, FV-NI | $ 34,515 | $ 32,193

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