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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2022
Mar. 15, 2023
Jun. 30, 2022
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Current Fiscal Year End Date --12-31    
Document Period End Date Dec. 31, 2022    
Document Transition Report false    
Entity File Number 01-35525    
Entity Registrant Name SMITH MICRO SOFTWARE, INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 33-0029027    
Entity Address, Address Line One 5800 Corporate Drive    
Entity Address, City or Town Pittsburgh    
Entity Address, State or Province PA    
Entity Address, Postal Zip Code 15237    
City Area Code 412    
Local Phone Number 837-5300    
Title of 12(b) Security Common Stock, par value $0.001 per share    
Trading Symbol SMSI    
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    
ICFR Auditor Attestation Flag false    
Entity Shell Company false    
Entity Public Float     $ 120,823,459
Entity Common Stock, Shares Outstanding   58,676,684  
Documents Incorporated by Reference
DOCUMENTS INCORPORATED BY REFERENCE
Portions of the registrant’s Proxy Statement for the 2023 Annual Meeting of Stockholders to be filed under the Securities Exchange Act of 1934 are incorporated by reference in Part III of this report.
    
Entity Central Index Key 0000948708    
Document Fiscal Year Focus 2022    
Document Fiscal Period Focus FY    
Amendment Flag false