DEI Document - shares	3 Months Ended
	Mar. 31, 2018	May 01, 2018	Jan. 03, 2018	Dec. 31, 2017
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	Mar. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Common Stock, Shares Outstanding		39,430,859
Common Stock, Shares, Outstanding	39,149,000		6,006,667	37,026,000