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Short-term and long-term investments - Additional Information (Details) - Investments in mutual funds and common stock - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Debt and Equity Securities, FV-NI [Line Items] |  |
Equity Securities, FV-NI, Gain (Loss) | $ (3,768) | $ 3,818
Equity Securities, FV-NI, Realized Gain | 1,762 | 1,941
Net Increase (Decrease) In Unrealized Losses On Equity Securities | $ 5,530 |
Net Increase (Decrease) In Unrealized Gains On Equity Securities |  | $ 1,877

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- Definition Amount of unrealized and realized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123583765&loc=SL75117546-209714 + Details
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- Definition Amount of realized gain from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123583765&loc=SL75117546-209714 + Details
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