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Stockholders' Equity - Common Stock Shares Reserved (Details) - shares | Mar. 31, 2023 | Dec. 31, 2022
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Stockholders' Equity |  |
Total (in shares) | 55,207,614 | 45,722,653
2016 Stock Option and Incentive Plan |  |
Stockholders' Equity |  |
Stock-based awards available for grant under 2016 Plan and ESPP (in shares) | 29,755,557 | 19,851,399
Common Stock Class A |  |
Stockholders' Equity |  |
Class A common stock reserved for Twilio.org (in shares) | 508,347 | 530,449
Stock options issued and outstanding |  |
Stockholders' Equity |  |
Stock options issued and outstanding (in shares) | 2,007,636 | 2,277,379
Unvested restricted stock units issued and outstanding |  |
Stockholders' Equity |  |
Unvested restricted stock units issued and outstanding (in shares) | 13,487,645 | 15,414,997
Stock-based awards available for grant under ESPP |  |
Stockholders' Equity |  |
Stock-based awards available for grant under 2016 Plan and ESPP (in shares) | 9,448,429 | 7,648,429

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(ii) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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