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Stockholders' Equity - Additional Information (Details) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Mar. 31, 2025 USD ($) vote plan class $ / shares shares | Mar. 31, 2024 USD ($) shares | Dec. 31, 2024 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of common stock classes | class |  | 2 |  |
Number of equity incentive plan | plan |  | 2 |  |
Options granted (in shares) |  | 0 | 0 |
Proceeds from exercise of stock options | $ |  | $ 1,673 | $ 2,191 |
Intrinsic value of options exercised | $ |  | 168,400 | 164,700 |
Stock-based compensation, net of amounts capitalized | $ |  | $ 164,265 | $ 135,033 |
Unvested restricted stock in connection with acquisition |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Awarded (in shares) |  | 0 |  |
RSUs and Restricted Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total compensation cost related to unvested awards not yet recognized | $ |  | $ 1,310,000 |  | $ 1,378,100
Weighted average period over compensation cost related to unvested employee awards |  | 2 years 8 months 12 days |  | 2 years 9 months 18 days
PSUs |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total compensation cost related to unvested awards not yet recognized | $ |  | $ 39,700 |  | $ 52,300
Weighted average period over compensation cost related to unvested employee awards |  | 1 year 4 months 24 days |  | 1 year 3 months 18 days
2019 Equity Incentive Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares available for grant (in shares) |  | 100,599,679 |  |
Employee Stock Purchase Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based payment arrangement, expiration period | 6 months | 27 months |  |
Purchase price as percentage of fair market value | 85.00% |  |  |
Stock-based compensation, net of amounts capitalized | $ |  | $ 4,400 |  |
Amounts withheld on behalf of employees for a future purchase | $ |  | $ 23,000 |  |
Class A Common Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of voting rights entitled to stockholders per share (in dollars per share) | vote |  | 1 |  |
Common stock, authorized (in shares) |  | 2,000,000,000 |  | 2,000,000,000
Common stock, par value (in dollars per share) | $ / shares |  | $ 0.00001 |  | $ 0.00001
Common stock, issued (in shares) |  | 319,232,516 |  | 316,787,538
Common stock, outstanding (in shares) |  | 319,232,516 |  | 316,787,538
Stock issuable upon the exercise of options outstanding (in shares) |  | 17,795 |  | 17,795
Class A Common Stock | Employee Stock Purchase Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Remaining common stock available for grant under ESPP (in shares) |  | 23,763,794 |  |
Class B Common Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of voting rights entitled to stockholders per share (in dollars per share) | vote |  | 10 |  |
Common stock, number of shares converted (in shares) |  | 183,585 |  |
Common stock, authorized (in shares) |  | 310,000,000 |  | 310,000,000
Common stock, par value (in dollars per share) | $ / shares |  | $ 0.00001 |  | $ 0.00001
Common stock, issued (in shares) |  | 25,678,293 |  | 25,331,244
Common stock, outstanding (in shares) |  | 25,678,293 |  | 25,331,244
Stock issuable upon the exercise of options outstanding (in shares) |  |  |  | 6,935,324
Class B Common Stock | 2012 Equity Incentive Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock issuable upon the exercise of options outstanding (in shares) |  | 5,619,191 |  |

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- Definition Number of shares remaining authorized to be purchased under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_AwardTypeAxis=ddog_RestrictedStockUnitsAndRestrictedStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |