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WARRANTS AND STOCK OPTIONS (Details)	6 Months Ended
	Mar. 31, 2022 $ / shares shares
Number of Shares
Balance at October 1, 2021 | shares	745,268
Granted | shares	2,962,413
Exercised | shares	0
Cancelled or expired | shares	(719,518)
Balance at December 31, 2021 | shares	2,988,163
Weighted Average Exercise Price Per Share
Balance at October 1, 2021 | $ / shares	$ 6.44
Granted | $ / shares	2.11
Exercised | $ / shares	0
Cancelled or expired | $ / shares	6.16
Balance at December 31, 2021 | $ / shares	$ 2.22

X

- Definition

This element represents the number of warrants exercised by participants.

+ References

No definition available.

+ Details

Name:	apdn_ClassOfWarrantOrRightExercised
Namespace Prefix:	apdn_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

This element represents the number of warrants that were either cancelled or expired.

+ References

No definition available.

+ Details

Name:	apdn_ClassOfWarrantOrRightForfeituresAndExpirations
Namespace Prefix:	apdn_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

This element represents number of warrants granted to participants.

+ References

No definition available.

+ Details

Name:	apdn_ClassOfWarrantOrRightGranted
Namespace Prefix:	apdn_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

Name:	apdn_ClassOfWarrantOrRightNumberOfSharesRollForward
Namespace Prefix:	apdn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

Name:	apdn_ClassOfWarrantOrRightWeightedAveragePricePerShareRollForward
Namespace Prefix:	apdn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents weighted average exercise price per share or per unit of warrants or rights Cancelled or expired.

+ References

No definition available.

+ Details

Name:	apdn_WeightedAveragePricePerShareWarrantCancelledOrExpired
Namespace Prefix:	apdn_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents weighted average exercise price per share or per unit of warrants or rights exercised.

+ References

No definition available.

+ Details

Name:	apdn_WeightedAveragePricePerShareWarrantExercised
Namespace Prefix:	apdn_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents weighted average exercise price per share or per unit of warrants or rights granted.

+ References

No definition available.

+ Details

Name:	apdn_WeightedAveragePricePerShareWarrantGranted
Namespace Prefix:	apdn_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents weighted average exercise price per share or per unit of warrants or rights outstanding.

+ References

No definition available.

+ Details

Name:	apdn_WeightedAveragePricePerShareWarrantOutstanding
Namespace Prefix:	apdn_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number of warrants or rights outstanding.

+ References

No definition available.

+ Details

Name:	us-gaap_ClassOfWarrantOrRightOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant