CAPITAL STOCK	12 Months Ended
Sep. 30, 2017
Stockholders' Equity Note [Abstract]
CAPITAL STOCK	NOTE G – CAPITAL STOCK Common Stock Transactions during and subsequent to the Fiscal Year Ended September 30, 2017: On November 2, 2016, the Company entered into a securities purchase agreement with an institutional investor providing for the purchase of $5 million of common stock and warrants at a combined price of $2.20 per share of common stock and warrant (the “Private Placement”). In the Private Placement, the Company sold 2,272,727 shares of its common stock and warrants to purchase 2,272,727 shares of its common stock. The warrants have the same terms as the Company’s existing publicly traded warrants (APDNW) with an exercise price of $3.50 per share and an expiration date of November 20, 2019. The offering closed on November 7, 2016. The Company filed a registration statement providing for the resale of these securities on Form S-3 by December 7, 2016. Upon effectiveness of the registration statement, it is expected that the common stock and warrants issued in the Private Placement will be freely tradeable on The NASDAQ Capital Market under the symbols “APDN” and “APDNW”, respectively. The aggregate gross proceeds to the Company from the Private Placement were $5 million before deducting the placement agents’ fee and other offering expenses. In connection with the closing of this Private Placement, as partial compensation, on November 7, 2016, the Company granted warrants to purchase an aggregate of 68,182 shares of its common stock to the Company’s placement agents, Maxim Group LLC and Imperial Capital LLC (the “Placement Agent Warrants”) at an exercise price of $2.53 (115% of the public offering price), subject to adjustment as set forth therein (including for stock dividends and splits and certain other distributions and “Fundamental Transactions,” as defined therein). The Placement Agent Warrants will be exercisable beginning six months following the closing date of the Private Placement and terminate at 5:00 P.M. (Eastern Standard Time) on November 7, 2021. In addition, the Placement Agent Warrants provide for cashless exercise, which the Placement Agents may elect if there is no effective registration statement registering the resale of the shares issuable upon exercise of the Placement Agent Warrants. The number of shares of common stock that may be acquired by the Placement Agents upon any exercise of the Placement Agent Warrants (or otherwise in respect hereof) shall be limited to the extent necessary to insure that, following such exercise, the total number of shares of common stock then beneficially owned by the Placement Agent and its Affiliates (as defined therein) and any other Persons whose beneficial ownership of common stock would be aggregated with the Placement Agent pursuant to the Exchange Act, does not exceed 9.99% of the total number of issued and outstanding shares of common stock. On June 28, 2017 the Company entered into subscription agreements for a private placement of its common stock, with a group of investors, including a strategic investor which is also a key customer and intellectual property licensee of the Company as well as all of the Company’s executive officers and all members of the Board of Directors (the “June Private Placement”). As a result of the June Private Placement, the Company issued 1,025,574 shares of common stock at a price of $1.76 per share for total gross proceeds of $1,805,000. As part of the June Private Placement, the Company’s management and Board of Directors purchased 315,346 shares of common stock for gross proceeds of $555,000. The issuance of the Common Stock was exempt from the registration requirements of the Securities Act of 1933 pursuant to Section 4(a)(2) of such Securities Act and Regulation D promulgated thereunder and such Common Stock therefore is restricted. Each investor gave representations that he, she or it was an “accredited investor” (as defined under Rule 501 of Regulation D) and that he, she or it is purchasing such securities without a present view toward a distribution of the securities. In addition, there was no general solicitation conducted in connection with the offer and sale of the securities. On December 22, 2017, the Company entered into a securities purchase agreement with certain institutional investors for the purchase and sale of 2,735,000 shares of our common stock and warrants to purchase an aggregate of 2,735,000 shares of common stock in a registered direct offering with aggregate gross proceeds of $4,786,250, at a combined purchase price of $1.75 per share. The warrants will be immediately exercisable at a price of $2.00 per share of common stock and will expire five years from the date of issuance. After deducting placement agent fees and other estimated expenses related to the registered direct offering, the company estimates the aggregate net proceeds to be approximately $4,200,000. The warrants will be exercisable for five years from the Initial Exercise Date, but not thereafter. The Purchase Warrants include an adjustment provision that, subject to certain exceptions, reduces their exercise price if the Company issues Common Stock or Common Stock equivalents at a price lower than the then-current exercise price of the Purchase Warrants, subject to a minimum exercise price of $0.44. The exercise price and number of the shares of our Common Stock issuable upon the exercise of the warrants will be subject to adjustment as set forth therein (including for stock dividends and splits, reverse stock split, recapitalization, reorganization or similar transaction). In addition, if and only if there is no effective registration statement registering, or no current prospectus available for, the resale of the Purchase Warrants, the Purchasers may exercise the Purchase Warrants by means of a “cashless exercise.” Common Stock Transactions during the Fiscal Year Ended September 30, 2016: On November 23, 2015, the Company entered into a securities purchase agreement with certain institutional investors providing for the purchase and sale of 2,500,000 shares of common stock at a price of $3.49 per share in a registered direct public offering. In a concurrent private placement, the Company sold warrants to purchase 1,250,000 shares of its common stock at a price of $0.01 per warrant, with an exercise price of $4.30 per share. The warrants were exercisable beginning six months following the closing date of the private placement and will expire five years from the date on which they become exercisable. The gross proceeds to the Company from this registered direct offering and private placement before deducting the placement agent fees and offering expenses, is $8.75 million. In connection with the closing of the registered direct offering and the concurrent private placement, as partial compensation, on November 25, 2015, the Company granted warrants to purchase 50,000 shares of common stock to its placement agent. These warrants have an exercise price of $4.03 (115% of the public offering price), subject to adjustment as set forth therein, will be exercisable beginning six months following the closing date of the Private Placement and expire at 5:00 PM (Eastern Standard Time) on November 25, 2020. During the fiscal year ended September 30, 2016, the Company granted 24,000 shares of common stock to consultants for a total expense of approximately $78,130 pursuant to the Company’s 2005 Incentive Stock Plan (the “Incentive Plan”).

CAPITAL STOCK

12 Months Ended

Sep. 30, 2017

Stockholders' Equity Note [Abstract]

NOTE G – CAPITAL STOCK

Common Stock Transactions during and subsequent to the Fiscal Year Ended September 30, 2017:

On November 2, 2016, the Company entered into a securities purchase agreement with an institutional investor providing for the purchase of $5 million of common stock and warrants at a combined price of $2.20 per share of common stock and warrant (the “Private Placement”). In the Private Placement, the Company sold 2,272,727 shares of its common stock and warrants to purchase 2,272,727 shares of its common stock. The warrants have the same terms as the Company’s existing publicly traded warrants (APDNW) with an exercise price of $3.50 per share and an expiration date of November 20, 2019. The offering closed on November 7, 2016.

The Company filed a registration statement providing for the resale of these securities on Form S-3 by December 7, 2016. Upon effectiveness of the registration statement, it is expected that the common stock and warrants issued in the Private Placement will be freely tradeable on The NASDAQ Capital Market under the symbols “APDN” and “APDNW”, respectively.

The aggregate gross proceeds to the Company from the Private Placement were $5 million before deducting the placement agents’ fee and other offering expenses.

In connection with the closing of this Private Placement, as partial compensation, on November 7, 2016, the Company granted warrants to purchase an aggregate of 68,182 shares of its common stock to the Company’s placement agents, Maxim Group LLC and Imperial Capital LLC (the “Placement Agent Warrants”) at an exercise price of $2.53 (115% of the public offering price), subject to adjustment as set forth therein (including for stock dividends and splits and certain other distributions and “Fundamental Transactions,” as defined therein). The Placement Agent Warrants will be exercisable beginning six months following the closing date of the Private Placement and terminate at 5:00 P.M. (Eastern Standard Time) on November 7, 2021. In addition, the Placement Agent Warrants provide for cashless exercise, which the Placement Agents may elect if there is no effective registration statement registering the resale of the shares issuable upon exercise of the Placement Agent Warrants. The number of shares of common stock that may be acquired by the Placement Agents upon any exercise of the Placement Agent Warrants (or otherwise in respect hereof) shall be limited to the extent necessary to insure that, following such exercise, the total number of shares of common stock then beneficially owned by the Placement Agent and its Affiliates (as defined therein) and any other Persons whose beneficial ownership of common stock would be aggregated with the Placement Agent pursuant to the Exchange Act, does not exceed 9.99% of the total number of issued and outstanding shares of common stock.

On June 28, 2017 the Company entered into subscription agreements for a private placement of its common stock, with a group of investors, including a strategic investor which is also a key customer and intellectual property licensee of the Company as well as all of the Company’s executive officers and all members of the Board of Directors (the “June Private Placement”). As a result of the June Private Placement, the Company issued 1,025,574 shares of common stock at a price of $1.76 per share for total gross proceeds of $1,805,000. As part of the June Private Placement, the Company’s management and Board of Directors purchased 315,346 shares of common stock for gross proceeds of $555,000. The issuance of the Common Stock was exempt from the registration requirements of the Securities Act of 1933 pursuant to Section 4(a)(2) of such Securities Act and Regulation D promulgated thereunder and such Common Stock therefore is restricted. Each investor gave representations that he, she or it was an “accredited investor” (as defined under Rule 501 of Regulation D) and that he, she or it is purchasing such securities without a present view toward a distribution of the securities. In addition, there was no general solicitation conducted in connection with the offer and sale of the securities.

On December 22, 2017, the Company entered into a securities purchase agreement with certain institutional investors for the purchase and sale of 2,735,000 shares of our common stock and warrants to purchase an aggregate of 2,735,000 shares of common stock in a registered direct offering with aggregate gross proceeds of $4,786,250, at a combined purchase price of $1.75 per share. The warrants will be immediately exercisable at a price of $2.00 per share of common stock and will expire five years from the date of issuance.

After deducting placement agent fees and other estimated expenses related to the registered direct offering, the company estimates the aggregate net proceeds to be approximately $4,200,000.

The warrants will be exercisable for five years from the Initial Exercise Date, but not thereafter. The Purchase Warrants include an adjustment provision that, subject to certain exceptions, reduces their exercise price if the Company issues Common Stock or Common Stock equivalents at a price lower than the then-current exercise price of the Purchase Warrants, subject to a minimum exercise price of $0.44. The exercise price and number of the shares of our Common Stock issuable upon the exercise of the warrants will be subject to adjustment as set forth therein (including for stock dividends and splits, reverse stock split, recapitalization, reorganization or similar transaction).

In addition, if and only if there is no effective registration statement registering, or no current prospectus available for, the resale of the Purchase Warrants, the Purchasers may exercise the Purchase Warrants by means of a “cashless exercise.”

Common Stock Transactions during the Fiscal Year Ended September 30, 2016:

On November 23, 2015, the Company entered into a securities purchase agreement with certain institutional investors providing for the purchase and sale of 2,500,000 shares of common stock at a price of $3.49 per share in a registered direct public offering. In a concurrent private placement, the Company sold warrants to purchase 1,250,000 shares of its common stock at a price of $0.01 per warrant, with an exercise price of $4.30 per share. The warrants were exercisable beginning six months following the closing date of the private placement and will expire five years from the date on which they become exercisable. The gross proceeds to the Company from this registered direct offering and private placement before deducting the placement agent fees and offering expenses, is $8.75 million.

In connection with the closing of the registered direct offering and the concurrent private placement, as partial compensation, on November 25, 2015, the Company granted warrants to purchase 50,000 shares of common stock to its placement agent. These warrants have an exercise price of $4.03 (115% of the public offering price), subject to adjustment as set forth therein, will be exercisable beginning six months following the closing date of the Private Placement and expire at 5:00 PM (Eastern Standard Time) on November 25, 2020.

During the fiscal year ended September 30, 2016, the Company granted 24,000 shares of common stock to consultants for a total expense of approximately $78,130 pursuant to the Company’s 2005 Incentive Stock Plan (the “Incentive Plan”).