Document And Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2025	Feb. 26, 2026	Jun. 30, 2025
Document Information [Line Items]
Entity Central Index Key	0000948708
Entity Registrant Name	Smith Micro Software, Inc.
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2025
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2025
Document Transition Report	false
Entity File Number	01-35525
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
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Public Float			$ 10,935,493
Entity Common Stock, Shares Outstanding		25,763,019
Auditor Firm ID	367
Auditor Name	SingerLewak LLP
Auditor Location	Los Angeles, California