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Nature of Business (Details Narrative) - USD ($)
 3 Months Ended
Apr. 09, 2020
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Number of patents, description   Intellicheck continues to develop and release innovative products based upon its rich patent portfolio consisting of twenty issued patents and five pending.    
Net loss   $ 26,602 $ (1,212,991)  
Net cash used in operating activities   (460,657) $ (542,249)  
Cash   3,010,089   $ 3,350,853
Working capital   3,128,680    
Accumulated deficit   $ (116,908,510)   $ (116,935,112)
Subsequent Event [Member] | U.S. Small Business Administration [Member] | Unsecured Promissory Note [Member]        
Debt instrument, face amount $ 796,100      
Debt instrument, description The Company received these proceeds on April 14, 2020. Under the terms of the Note, the Company can apply for forgiveness on this Note with the Loan Servicer if certain conditions including the use of the Note proceeds are met over an eight-week period commencing from the date of the Note. If all or part of this Note is not forgiven, the Note has an interest rate of 1% and must be repaid within two years from the date of the Note.