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Net Loss Per Share Attributable to Common Stockholders - Anti-Dilutive Securities (Details) - shares | 9 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Antidilutive securities (in shares) | 22,892,127 | 18,290,790
Stock options issued and outstanding |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Antidilutive securities (in shares) | 1,778,852 | 2,488,072
Unvested restricted stock units issued and outstanding |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Antidilutive securities (in shares) | 20,263,588 | 14,970,869
Shares of Class A common stock reserved for Twilio.org |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Antidilutive securities (in shares) | 464,143 | 552,551
Shares of Class A common stock committed under ESPP |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Antidilutive securities (in shares) | 350,270 | 191,558
Shares of Class A common stock in escrow |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Antidilutive securities (in shares) | 31,503 | 31,503
Shares of Class A common stock in escrow and restricted stock awards subject to future vesting |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Antidilutive securities (in shares) | 3,771 | 56,237

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-1 + 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 No definition available. + Details
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