Short-term and long-term investments - Additional Information (Details) - Investments in mutual funds and common stock - USD ($) $ in Thousands	12 Months Ended
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

Net Increase Decrease In Unrealized Gains On Equity Securities

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- Definition

Net Increase Decrease In Unrealized Losses On Equity Securities

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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

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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).

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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