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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2020
Mar. 02, 2021
Jun. 30, 2020
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2020    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Trading Symbol SMSI    
Entity Registrant Name SMITH MICRO SOFTWARE, INC.    
Entity Central Index Key 0000948708    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer No    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Non-accelerated Filer    
Entity Shell Company false    
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Tax Identification Number 33-0029027    
Entity File Number 01-35525    
Entity Incorporation, State or Country Code DE    
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    
Security Exchange Name NASDAQ    
Title of 12(b) Security Common Stock, par value $0.001 per share    
Document Annual Report true    
Document Transition Report false    
Entity Interactive Data Current Yes    
Entity Common Stock, Shares Outstanding   42,216,795  
Entity Public Float     $ 150,928,875
ICFR Auditor Attestation Flag false    
Documents Incorporated by Reference

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the registrant’s Proxy Statement for the 2021 Annual Meeting of Stockholders to be filed under the Securities Exchange Act of 1934 are incorporated by reference in Part III of this report.