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Statements of Stockholders' Equity (Parenthetical) - shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Stockholders' Equity [Abstract]
Exercise of stock options, net of cashless exercise of shares	58,122	2,451

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- Definition

Exercise of stock options, net of cashless exercise of shares.

+ References

No definition available.

+ Details

Name:	IDN_ExerciseOfStockOptionsNetOfCashlessExerciseShares
Namespace Prefix:	IDN_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_StatementOfStockholdersEquityAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration