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Document and Entity Information - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Feb. 13, 2025
Jun. 30, 2024
Document Information [Line Items]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2024    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Entity Registrant Name AMPLITUDE, INC.    
Entity Central Index Key 0001866692    
Current Fiscal Year End Date --12-31    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Title of 12(b) Security Class A Common Stock, $0.00001 par value per share    
Trading Symbol AMPL    
Security Exchange Name NASDAQ    
Entity Current Reporting Status Yes    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Interactive Data Current Yes    
Entity Incorporation, State or Country Code DE    
Entity File Number 001-40817    
Entity Tax Identification Number 45-3937349    
Entity Address, Address Line One 201 Third Street    
Entity Address, Address Line Two Suite 200    
Entity Address, City or Town San Francisco    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 94103    
City Area Code 415    
Local Phone Number 231-2353    
ICFR Auditor Attestation Flag true    
Entity Public Float     $ 767.1
Document Annual Report true    
Document Transition Report false    
Auditor Name KPMG LLP    
Auditor Firm ID 185    
Auditor Location Santa Clara, California    
Documents Incorporated by Reference [Text Block]

Portions of the registrant’s definitive proxy statement for the registrant’s 2025 annual meeting of stockholders, which will be filed with the Securities and Exchange Commission no later than 120 days after December 31, 2024, are incorporated by reference in Part III of this Annual Report on Form 10-K.

    
Auditor Opinion

Opinions on the Consolidated Financial Statements and Internal Control Over Financial Reporting

We have audited the accompanying consolidated balance sheets of Amplitude, Inc. and subsidiaries (the Company) as of December 31, 2024 and 2023, the related consolidated statements of operations and comprehensive loss, stockholders’ equity, and cash flows for each of the years in the three-year period ended December 31, 2024, and the related notes (collectively, the consolidated financial statements). We also have audited the Company’s internal control over financial reporting as of December 31, 2024, based on criteria established in Internal Control – Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission.

In our opinion, the consolidated financial statements referred to above present fairly, in all material respects, the financial position of the Company as of December 31, 2024 and 2023, and the results of its operations and its cash flows for each of the years in the three-year period ended December 31, 2024, in conformity with U.S. generally accepted accounting principles. Also in our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2024 based on criteria established in Internal Control – Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission.

    
Class A Common Stock      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding   96,317,761  
Class B Common Stock      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding   33,093,043