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Stockholders' Equity - Common Stock Shares Reserved (Details) - shares	Mar. 31, 2025	Dec. 31, 2024
Stockholders' Equity
Total (in shares)	59,956,015	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)	31,234,619	23,292,678
Common Stock Class A
Stockholders' Equity
Shares of Class A common stock reserved for Twilio.org (in shares)	331,531	353,633
Stock options issued and outstanding
Stockholders' Equity
Stock options issued and outstanding (in shares)	1,190,661	1,322,176
Unvested restricted stock units issued and outstanding
Stockholders' Equity
Unvested restricted stock units issued and outstanding (in shares)	15,963,772	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)	11,235,432	9,709,326

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Aggregate number of common shares reserved for future issuance.

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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.

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-Topic 718
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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.

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Number of options outstanding, including both vested and non-vested options.

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