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Fair Value of Financial Instruments - Assets measured on a recurring basis (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Fair value of financial instruments |  |  |
Long term investments | $ 153,663 | $ 133,676 | [1]
Fair Value, Recurring | Estimate of Fair Value Measurement |  |  |
Fair value of financial instruments |  |  |
Cash and cash equivalents | 3,227,230 | 2,951,422 |
Debt securities (government) | 289,223 | 287,543 |
Long term investments | 153,663 | 133,676 |
Total assets | 3,670,116 | 3,372,641 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Recurring |  |  |
Fair value of financial instruments |  |  |
Cash and cash equivalents | 3,227,230 | 2,951,422 |
Debt securities (government) | 0 | 0 |
Long term investments | 153,663 | 133,676 |
Total assets | 3,380,893 | 3,085,098 |
Significant Other Observable Inputs (Level 2) | Fair Value, Recurring |  |  |
Fair value of financial instruments |  |  |
Cash and cash equivalents | 0 | 0 |
Debt securities (government) | 289,223 | 287,543 |
Long term investments | 0 | 0 |
Total assets | 289,223 | 287,543 |
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring |  |  |
Fair value of financial instruments |  |  |
Cash and cash equivalents | 0 | 0 |
Debt securities (government) | 0 | 0 |
Long term investments | 0 | 0 |
Total assets | $ 0 | $ 0 |
[1] | The condensed consolidated balance sheet at December 31, 2022 has been derived from the audited consolidated financial statements at that date.

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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- Definition Amortized cost excluding accrued interest, after allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479130/326-30-45-1 + Details
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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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-3 + Details
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