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Cover Page - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Mar. 28, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2023    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2023    
Entity Registrant Name KLDiscovery Inc.    
Entity Central Index Key 0001752474    
Current Fiscal Year End Date --12-31    
Entity Filer Category Non-accelerated Filer    
Entity Emerging Growth Company true    
Entity Ex Transition Period false    
Entity Small Business true    
Entity Interactive Data Current Yes    
Entity Current Reporting Status Yes    
ICFR Auditor Attestation Flag false    
Entity Shell Company false    
Entity Common Stock, Shares Outstanding   43,086,267  
Entity Public Float     $ 21.5
Entity File Number 001-38789    
Entity Tax Identification Number 61-1898603    
Entity Address, Address Line One 9023 Columbine Road    
Entity Address, City or Town Eden Prairie    
Entity Address, State or Province MN    
Entity Address, Postal Zip Code 55347    
City Area Code 703    
Local Phone Number 288-3380    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Incorporation, State or Country Code DE    
Document Annual Report true    
Document Transition Report false    
Auditor Name Ernst & Young LLP    
Auditor Firm ID 42    
Auditor Location Tysons, Virginia    
Documents Incorporated by Reference

DOCUMENTS INCORPORATED BY REFERENCE

 

Portions of the registrant’s definitive proxy statement relating to its annual meeting of stockholders to be held in 2024 (the “2024 Annual Meeting”), to be filed with the Securities and Exchange Commission (the “SEC”) within 120 days after the end of the fiscal year to which this Annual Report on Form 10-K relates, are incorporated herein by reference where indicated. Except with respect to information specifically incorporated by reference in this Annual Report on Form 10-K, such proxy statement is not deemed to be filed as part hereof.

    
Document Financial Statement Error Correction [Flag] false