v3.26.1
Document and Entity Information - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Mar. 11, 2026
Jun. 30, 2025
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2025    
Document Transition Report false    
Entity File Number 001-37990    
Entity Registrant Name CYPHERPUNK TECHNOLOGIES INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 27-4412575    
Entity Address, Address Line One 47 Thorndike Street    
Entity Address, Address Line Two Suite B1-1    
Entity Address, City or Town Cambridge    
Entity Address, State or Province MA    
Entity Address, Postal Zip Code 02141    
City Area Code 617    
Local Phone Number 714-0360    
Title of 12(b) Security Common Stock, par value $0.001    
Trading Symbol CYPH    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Shell Company false    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction false    
Entity Public Float     $ 12.1
Entity Common Stock, Shares Outstanding   89,979,619  
Documents Incorporated by Reference

Portions of the registrant’s definitive proxy statement for its 2026 Annual Meeting of Stockholders, which is expected to be filed with the Securities and Exchange Commission not later than 120 days after the end of the registrant’s fiscal year ended December 31, 2025, are incorporated by reference into Part III, Items 10-14 of this Annual Report on Form 10-K. With the exception of the portions of the registrant’s definitive proxy statement for its 2026 Annual Meeting of Stockholders that are expressly incorporated by reference into this Annual Report on Form 10-K, such proxy statement shall not be deemed filed as part of this Annual Report on Form 10-K.

    
Auditor Name EisnerAmper LLP    
Auditor Firm ID 274    
Auditor Location Philadelphia, Pennsylvania    
Entity Central Index Key 0001509745    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2025    
Document Fiscal Period Focus FY    
Amendment Flag false