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Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands | Total | Additional Paid-in Capital [Member] | Accumulated Deficit [Member] | Accumulated Other Comprehensive Loss [Member] | Class A Common Stock [Member] | Class A Common Stock [Member] Common Stock [Member] | Class B Common Stock [Member] | Class B Common Stock [Member] Common Stock [Member]
--- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2022 |  | $ 128,030 | $ 900,924 | $ (771,056) | $ (2,045) |  | $ 175 |  |  | $ 32 |
Balance (in shares) at Dec. 31, 2022 |  |  |  |  |  |  | 175,266,917 |  |  | 32,099,302 |
Shares issued in connection with certain agreements |  | 5,387 | 5,386 |  |  |  | $ 1 |  |  |  |
Shares issued in connection with certain agreements (in shares) |  |  |  |  |  |  | 651,369 |  |  |  |
Restricted stock grants |  |  | (11) |  |  |  | $ 11 |  |  |  |
Restricted stock grants (in shares) |  |  |  |  |  |  | 11,467,755 |  |  |  |
Shares issued in connection with employee stock purchase plan |  | 3,058 | 3,058 |  |  |  |  |  |  |  |
Shares issued in connection with employee stock purchase plan (in shares) |  |  |  |  |  |  | 424,654 |  |  |  |
Shares repurchased |  | (15,421) | (15,421) |  |  |  |  |  |  |  |
Shares repurchased (in shares) |  |  |  |  |  |  | (1,360,153) |  |  | (325,923) |
Restricted stock forfeitures |  |  | 1 |  |  |  | $ (1) |  |  |  |
Restricted stock forfeitures (in shares) |  |  |  |  |  |  | (1,241,675) |  |  |  |
Class B common stock transferred to Class A common stock |  |  |  |  |  |  | $ 3 |  |  | $ (3) |
Class B common stock transferred to Class A common stock (in shares) |  |  |  |  |  |  | 2,717,890 |  |  | (2,717,890) |
Performance stock units vesting (in shares) |  |  |  |  |  |  | 142,500 |  |  |  |
Options exercised |  | 241 | 241 |  |  |  |  |  |  |  |
Options exercised (in shares) |  |  |  |  |  |  | 63,500 |  |  |  |
Stock-based compensation |  | 246,671 | 246,671 |  |  |  |  |  |  |  |
Restricted stock units vesting (in shares) |  |  |  |  |  |  | 498,675 |  |  |  |
Foreign currency translation adjustment |  | 35 |  |  | 35 |  |  |  |  |  |
Net Income (Loss) |  | (187,481) |  | (187,481) |  |  |  |  |  |  |
Balance at Dec. 31, 2023 | [1] | 180,520 | 1,140,849 | (958,537) | (2,010) |  | $ 189 |  |  | $ 29 |
Balance (in shares) at Dec. 31, 2023 |  |  |  |  |  | 150,989,571 | 188,631,432 | [1] | 17,886,352 | 29,055,489 | [1]
Shares issued in connection with a follow-on public offering |  | 228,956 | 228,946 |  |  |  | $ 10 |  |  |  |
Shares issued in connection with a follow-on public offering (in shares) |  |  |  |  |  |  | 10,304,716 |  |  |  |
Shares issued in connection with certain agreements |  | 173,724 | 173,718 |  |  |  | $ 6 |  |  |  |
Shares issued in connection with certain agreements (in shares) |  |  |  |  |  |  | 5,948,199 |  |  |  |
Restricted stock grants |  |  | (2) |  |  |  | $ 2 |  |  |  |
Restricted stock grants (in shares) |  |  |  |  |  |  | 1,550,343 |  |  |  |
Shares issued in connection with employee stock purchase plan |  | 3,406 | 3,406 |  |  |  |  |  |  |  |
Shares issued in connection with employee stock purchase plan (in shares) |  |  |  |  |  |  | 348,130 |  |  |  |
Shares repurchased |  | (41,080) | (41,078) |  |  |  | $ (2) |  |  |  |
Shares repurchased (in shares) |  |  |  |  |  |  | (2,307,006) |  |  |  |
Restricted stock forfeitures (in shares) |  |  |  |  |  |  | (755,180) |  |  |  |
Class B common stock transferred to Class A common stock |  |  |  |  |  |  | $ 5 |  |  | $ (5) |
Class B common stock transferred to Class A common stock (in shares) |  |  |  |  |  |  | 4,960,418 |  |  | (4,960,418) |
Performance stock units vested |  |  | (3) |  |  |  | $ 3 |  |  |  |
Performance stock units vesting (in shares) |  |  |  |  |  |  | 3,539,683 |  |  |  |
Options exercised |  | 3,175 | 3,175 |  |  |  |  |  |  |  |
Options exercised (in shares) |  |  |  |  |  |  | 429,989 |  |  |  |
Stock-based compensation |  | 197,874 | 197,874 |  |  |  |  |  |  |  |
Restricted stock units vesting (in shares) |  |  |  |  |  |  | 524,455 |  |  |  |
Foreign currency translation adjustment |  | (3) |  |  | (3) |  |  |  |  |  |
Net Income (Loss) |  | (69,771) |  | (69,771) |  |  |  |  |  |  |
Balance at Dec. 31, 2024 | [2] | 676,801 | 1,706,885 | (1,028,308) | (2,013) |  | $ 213 |  |  | $ 24 |
Balance (in shares) at Dec. 31, 2024 |  |  |  |  |  | 193,189,610 | 213,175,179 | [2] | 17,776,198 | 24,095,071 | [2]
Shares issued in connection with certain agreements |  | 98,697 | 98,691 |  |  |  | $ 6 |  |  |  |
Shares issued in connection with certain agreements (in shares) |  |  |  |  |  |  | 5,716,934 |  |  |  |
Purchase price allocation adjustments |  | (9,006) | (9,006) |  |  |  |  |  |  |  |
Restricted stock grants (in shares) |  |  |  |  |  |  | 282,210 |  |  |  |
Shares issued in connection with employee stock purchase plan |  | 4,247 | 4,246 |  |  |  | $ 1 |  |  |  |
Shares issued in connection with employee stock purchase plan (in shares) |  |  |  |  |  |  | 380,404 |  |  |  |
Shares repurchased |  | (120,094) | (120,086) |  |  |  | $ (8) |  |  |  |
Shares repurchased (in shares) |  |  |  |  |  |  | (7,899,208) |  |  |  |
Restricted stock forfeitures |  |  | 1 |  |  |  | $ (1) |  |  |  |
Restricted stock forfeitures (in shares) |  |  |  |  |  |  | (553,226) |  |  |  |
Class B common stock transferred to Class A common stock (in shares) |  |  |  |  |  |  | 456,645 |  |  | (456,645) |
Performance stock units vested |  |  | (7) |  |  |  | $ 7 |  |  |  |
Performance stock units vesting (in shares) |  |  |  |  |  |  | 6,737,176 |  |  |  |
Options exercised |  | 2,236 | 2,236 |  |  |  |  |  |  |  |
Options exercised (in shares) |  |  |  |  |  |  | 351,582 |  |  |  |
Stock-based compensation |  | 180,738 | 180,738 |  |  |  |  |  |  |  |
Restricted stock units vesting (in shares) |  |  |  |  |  |  | 2,534,610 |  |  |  |
Restricted stock units vested |  |  | (3) |  |  |  | $ 3 |  |  |  |
Foreign currency translation adjustment |  | 2,479 |  |  | 2,479 |  |  |  |  |  |
Net Income (Loss) |  | (31,509) |  | (31,509) |  |  |  |  |  |  |
Balance at Dec. 31, 2025 | [3] | $ 804,589 | $ 1,863,695 | $ (1,059,817) | $ 466 |  | $ 221 |  |  | $ 24 |
Balance (in shares) at Dec. 31, 2025 |  |  |  |  |  | 214,394,747 | 221,182,306 | [3] | 21,296,445 | 23,638,426 | [3]
[1] | Includes 150,989,571 outstanding shares of Class A Common Stock, 17,886,352 outstanding shares of Class B Common Stock, 37,641,861 unvested shares of Class A restricted stock and 11,169,137 unvested shares of Class B restricted stock.
[2] | Includes 193,189,610 outstanding shares of Class A Common Stock, 17,776,198 outstanding shares of Class B Common Stock, 19,985,569 unvested shares of Class A restricted stock and 6,318,873 unvested shares of Class B restricted stock.
[3] | Includes 214,394,747 outstanding shares of Class A Common Stock, 21,296,445 outstanding shares of Class B Common Stock, 6,787,559 unvested shares of Class A restricted stock and 2,341,981 unvested shares of Class B restricted stock.

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Name: | zeta_PurchasePriceAllocationAdjustments
Namespace Prefix: | zeta_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Stock issued during period shares performance stock award vesting. + References No definition available. + Details
Name: | zeta_StockIssuedDuringPeriodSharesPerformanceStockAwardVesting
Namespace Prefix: | zeta_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Stock issued during period shares restricted stock award vesting. + References No definition available. + Details
Name: | zeta_StockIssuedDuringPeriodSharesRestrictedStockAwardVesting
Namespace Prefix: | zeta_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Stock issued during period value performance stock award vesting. + References No definition available. + Details
Name: | zeta_StockIssuedDuringPeriodValuePerformanceStockAwardVesting
Namespace Prefix: | zeta_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Stock issued during period value restricted stock award vesting. + References No definition available. + Details
Name: | zeta_StockIssuedDuringPeriodValueRestrictedStockAwardVesting
Namespace Prefix: | zeta_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration