Document And Entity Information - shares	9 Months Ended
	Sep. 30, 2019	Nov. 08, 2019
Document And Entity Information [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2019
Document Transition Report	false
Entity File Number	001-34261
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	Q3
Document Fiscal Year Focus	2019
Entity Central Index Key	0001052054
Amendment Flag	false
Entity Registrant Name	EVOLVING SYSTEMS INC
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	84-1010843
Entity Address, Address Line One	9800 Pyramid Court
Entity Address, Address Line Two	Suite 400
Entity Address, City or Town	Englewood
Entity Address, State or Province	CO
Entity Address, Postal Zip Code	80112
City Area Code	303
Local Phone Number	802-1000
Title of 12(b) Security	Common Stock, par value $0.001 per share
Trading Symbol	evol
Security Exchange Name	NASDAQ
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
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		12,163,051