Long-term Investments - Carrying Value of Equity Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Total carrying value of the equity securities
Initial cost basis	$ 689,724	$ 662,460
Upward adjustments	92,736	85,710
Downward adjustments	(579,719)	(554,013)
Impairment charges		14,200
Foreign currency translation	(1,451)	2,422
Total carrying value at the end of the period	201,290	$ 196,579
Online education company
Total carrying value of the equity securities
Impairment charges	$ 15,900

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Amount of investment in equity security without readily determinable fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 321
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479536/321-10-50-3

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Amount of cumulative loss from downward price adjustment on investment in equity security without readily determinable fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 321
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479536/321-10-50-3

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Amount of cumulative impairment loss on investment in equity security without readily determinable fair value.

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 321
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479536/321-10-50-3

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