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Long-term Investment (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Long-term Investment
Time deposit	$ 186,751
Investments in available-for-sale debt securities	9,874	$ 17,665
U.S. treasury securities	10,140
Investments in equity securities accounted for under alternative measurement	488
Investment in an equity security with readily determinable fair values	236	366
Total long-term investments	$ 207,489	$ 18,031

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The carrying amount of time deposit assets as of balance sheet date, classified as noncurrent.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as noncurrent.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amount, after allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity), classified as noncurrent.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as noncurrent.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The total amount of investments that are intended to be held for an extended period of time (longer than one operating cycle).

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