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Fair Value of Financial Instruments - Valuation of financial instruments (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value of Financial Instruments |  |
Cash equivalents | $ 57,144 | $ 314,218
Short-term investments | 257,157 | 692,024
Total | 314,301 | 1,006,242
Money market funds |  |
Fair Value of Financial Instruments |  |
Cash equivalents | 57,144 | 310,969
Corporate debt securities |  |
Fair Value of Financial Instruments |  |
Cash equivalents |  | 3,249
Short-term investments | 166,868 | 501,014
Government debt securities |  |
Fair Value of Financial Instruments |  |
Short-term investments | 90,289 | 191,010
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair Value of Financial Instruments |  |
Cash equivalents | 57,144 | 310,969
Total | 57,144 | 310,969
Quoted Prices in Active Markets for Identical Assets (Level 1) | Money market funds |  |
Fair Value of Financial Instruments |  |
Cash equivalents | 57,144 | 310,969
Significant Other Observable Inputs (Level 2) |  |
Fair Value of Financial Instruments |  |
Cash equivalents |  | 3,249
Short-term investments | 257,157 | 692,024
Total | 257,157 | 695,273
Significant Other Observable Inputs (Level 2) | Corporate debt securities |  |
Fair Value of Financial Instruments |  |
Cash equivalents |  | 3,249
Short-term investments | 166,868 | 501,014
Significant Other Observable Inputs (Level 2) | Government debt securities |  |
Fair Value of Financial Instruments |  |
Short-term investments | $ 90,289 | $ 191,010

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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 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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