| Cover | May 12, 2022 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | May 12, 2022 |
| 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, $.001 par value |
| Trading Symbol | IDN |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
