Cover - USD ($)	12 Months Ended
	Dec. 31, 2021	Mar. 24, 2022	Jun. 30, 2021
Cover [Abstract]
Document Type	10-K/A
Amendment Flag	true
Amendment Description	This Amendment No. 2 (the “Amendment No. 2”) to the Annual Report on Form 10-K/A of Intellicheck, Inc. (the “Company”) for the fiscal year ended December 31, 2021, originally filed with the Securities and Exchange Commission (the “SEC”) on March 31, 2021 (the “Original Filing”) and amended with Amendment No. 1 filed June 9, 2022 (the “Amendment No. 1”), is being filed solely to include an amended signature page to Form 10-K which inadvertently included one conformed signature that the Company had not received when originally filed and thus is being removed
Document Annual Report	true
Document Transition Report	false
Document Period End Date	Dec. 31, 2021
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2021
Current Fiscal Year End Date	--12-31
Entity File Number	001-15465
Entity Registrant Name	Intellicheck, Inc.
Entity Central Index Key	0001040896
Entity Tax Identification Number	11-3234779
Entity Incorporation, State or Country Code	DE
Entity Address, Address Line One	200 Broadhollow Road
Entity Address, Address Line Two	Suite 207
Entity Address, City or Town	Melville
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	11747
City Area Code	(516)
Local Phone Number	992-1900
Title of 12(b) Security	Common Stock, $0.001 par value
Trading Symbol	IDN
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
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 Public Float			$ 127,083,038
Entity Common Stock, Shares Outstanding		18,674,980
Documents Incorporated by Reference [Text Block]	Proxy for Annual Meeting of Stockholders May 4, 2022
Auditor Firm ID	274
Auditor Name	EisnerAmper LLP
Auditor Location	Iselin New Jersey