DEI Document - shares	9 Months Ended
	Sep. 30, 2017	Nov. 03, 2017	Dec. 31, 2016
DEI [Abstract]
Common Stock, Shares, Issued	39,149,000		37,026,000
Entity Registrant Name	Radisys Corporation
Entity Central Index Key	0000873044
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Document Type	10-Q
Document Period End Date	Sep. 30, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Common Stock, Shares Outstanding		39,148,753
Common Stock, Shares, Outstanding	39,149,000		37,026,000