Document and Entity Information	3 Months Ended
	Mar. 31, 2012	Apr. 27, 2012
Document and Entity Information [Abstract]
Entity Registrant Name	SMITH MICRO SOFTWARE INC
Entity Central Index Key	0000948708
Document Type	10-Q
Document Period End Date	Mar. 31, 2012
Amendment Flag	false
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		36,122,952