Document and Entity Information - USD ($)		12 Months Ended
	Feb. 22, 2022	Dec. 31, 2021	Feb. 18, 2022	Jun. 30, 2021
Entity Information [Line Items]
Document Type		10-K
Document Annual Report		true
Document Fiscal Year Focus		2021
Document Period End Date		Dec. 31, 2021
Current Fiscal Year End Date		--12-31
Document Transition Report		false
Entity File Number		000-38334
Entity Registrant Name		Immersion Corp
Entity Incorporation, State or Country Code		DE
Entity Tax Identification Number		94-3180138
Entity Address, Address Line One	2999 N.E. 191st Street, Suite 610
Entity Address, City or Town	Aventura
Entity Address, State or Province	FL
Entity Address, Postal Zip Code	33180
City Area Code		408
Local Phone Number		467-1900
Entity Well-known Seasoned Issuer		No
Entity Voluntary Filers		No
Entity Current Reporting Status		Yes
Entity Interactive Data Current		Yes
ICFR Auditor Attestation Flag		false
Entity Shell Company		false
Entity Public Float				$ 230,817,516
Entity Common Stock, Shares Outstanding			33,522,918
Entity Central Index Key		0001058811
Document Fiscal Period Focus		FY
Amendment Flag		false
Documents Incorporated by Reference		Items 10 (as to directors and executive officers, and Delinquent Section 16(a) Reports (if any)), 11, 12 (as to Beneficial Ownership), 13 and 14 of Part III of this Annual Report on Form 10-K incorporate by reference portions of the Registrant’s definitive Proxy Statement for the 2022 Annual Meeting of Stockholders.
Entity Filer Category		Non-accelerated Filer
Entity Small Business		true
Entity Emerging Growth Company		false
Common Stock
Entity Information [Line Items]
Title of 12(b) Security		Common Stock, $0.001 par value
Trading Symbol		IMMR
Security Exchange Name		NASDAQ
Series B
Entity Information [Line Items]
Title of 12(b) Security		Series B Junior Participating Preferred Stock Purchase Rights
Trading Symbol		IMMR
Security Exchange Name		NASDAQ