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Stockholders' Equity - Common Stock Shares Reserved (Details) - shares | Sep. 30, 2025 | Dec. 31, 2024
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Stockholders' Equity |  |
Total (in shares) | 56,200,058 | 53,064,084
Stock-based awards available for grant under 2016 Plan |  |
Stockholders' Equity |  |
Stock-based awards available for grant under 2016 Plan and shares of class A common stock reserved for issuance pursuant to ESPP (in shares) | 28,721,606 | 23,292,678
Common Stock Class A |  |
Stockholders' Equity |  |
Shares of Class A common stock reserved for Twilio.org (in shares) | 287,327 | 353,633
Stock options issued and outstanding |  |
Stockholders' Equity |  |
Stock options issued and outstanding (in shares) | 937,881 | 1,322,176
Unvested restricted stock units issued and outstanding |  |
Stockholders' Equity |  |
Unvested restricted stock units issued and outstanding (in shares) | 15,271,110 | 18,386,271
Shares of Class A common stock reserved for issuance pursuant to ESPP |  |
Stockholders' Equity |  |
Stock-based awards available for grant under 2016 Plan and shares of class A common stock reserved for issuance pursuant to ESPP (in shares) | 10,982,134 | 9,709,326

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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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