Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2019	May 04, 2020	Jun. 30, 2019
Cover [Abstract]
Entity Registrant Name	Internap Corp
Entity Central Index Key	0001056386
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Document Type	10-K
Document Period End Date	Dec. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding		25,648,870
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 59,259,736
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Interactive Data Current	Yes