Short-Term Promissory Notes and Unsecured Loan	3 Months Ended
Mar. 31, 2018
Short-Term Promissory Notes and Unsecured Loan\Convertible Promissory Notes and Warrant Agreements [Abstract]
Short-Term Promissory Notes and Unsecured Loan	NOTE 7 – Short-Term Promissory Notes and Unsecured Loan Short-Term Promissory Notes In August 2017, the Company’s Board of Directors (the “Board”) authorized, and the Company issued short-term unsecured and interest-free promissory notes (the “Short-Term Notes”) for aggregate gross proceeds of $253,000 prior to issuance costs of $3,030 which were discounted from the Short-Term Notes and were amortized ratably to interest expense over the original term of the Short-Term Notes up though November 2017. On November 30, 2017, the Short-Term Notes were amended to extend the maturity date from February 18, 2018 to July 31, 2018 and to increase warrant coverage to 189,750 common stock purchase warrants (“Original Warrants”). The Original Warrants had a term of 5 years and an exercise price of $1.80 and would have been immediately exercisable upon maturity of the Short-Term Notes prior to the amendment described below. The November 30, 2017 amendment resulted in a substantial modification to the Short-Term Notes and was accounted for under the provisions of extinguishment accounting. The Short-Term Notes were subsequently amended and restated on March 12, 2018 (the “Amended and Restated Short-Term Notes”). The Amended and Restated Short-Term Notes became convertible promissory notes that bear interest at a fixed rate of 8% per annum and require the Company to repay the principal and accrued and unpaid interest thereon on the maturity date of July 31, 2018 (the “Short-Term Note Maturity Date”). Pursuant to the terms of each Amended and Restated Short-Term Note and a consent signed by the Company and each holder, the Original Warrants under the Short-Term Notes were modified whereby each subscriber received a replacement warrant (the “Replacement Warrant”) upon the issuance of the Amended and Restated Short-Term Note, in lieu of the Original Warrant. In addition, each holder was issued an additional warrant (the “Additional Warrant”). If the Company raises more than $3,000,000 in an equity or equity-linked financing before July 31, 2018 (the “Short-Term Note Qualified Financing”), the outstanding principal and accrued interest (the “Outstanding Balance”) on the Amended and Restated Short-Term Notes shall automatically convert into the securities issued by the Company in the Short-Term Note Qualified Financing (the “New Round Stock”) based on the greater number of such securities resulting from either (i) the Outstanding Balance divided by $1.80 or (ii) the Outstanding Balance multiplied by 1.25, divided by the price paid per security in the Short-Term Note Qualified Financing. If a change of control transaction occurs prior to the earlier of a Short-Term Note Qualified Financing or the Short-Term Note Maturity Date, the Amended and Restated Short-Term Notes would, at the election of the holders of a majority of the outstanding principal of the Amended and Restated Short-Term Notes, either become payable on demand as of the closing date of such transaction or become convertible into shares of common stock immediately prior to such transaction at a price per share equal to the lesser of (i) the per share value of the common stock as determined by the Board as if in connection with the granting of stock-based compensation or in a private sale to a third party in an arms’ length transaction or (ii) at the per share consideration to be paid in such transaction. The date of a conversion under a Short-Term Note Qualified Financing or a change of control transaction under the terms of the Amended and Restated Short-Term Notes is referred to herein as the “Conversion Date”. *Replacement Warrants* Each Replacement Warrant grants the holder the option to purchase up to the number of shares of capital stock of the Company equal to the New Round Stock issued or issuable upon the conversion of the Amended and Restated Short-Term Note held by such holder at a per share exercise price equal to either (i) the actual per share price of New Round Stock if the Amended and Restated Short-Term Notes converted in connection with a Short-Term Note Qualified Financing or (ii) the price at which the Amended and Restated Short-Term Notes converted in connection with a change of control transaction. The Replacement Warrants are exercisable commencing on the Conversion Date and expire on November 21, 2021. The exercise price and number of the shares issuable upon exercising the Replacement Warrants are subject to adjustment in the event of any stock dividends and splits, reverse stock split, recapitalization, reorganization or similar transaction, as described therein. The Replacement Warrants were deemed to be a free-standing instrument and were accounted for as a liability given the variable number of shares issuable in connection with a possible change of control conversion event. The Company recorded an initial liability of $137,722 upon issuance with an offset to extinguishment loss described further below. The fair value changes of the warrant liability associated with the Short-Term Notes are recorded at each reporting date in the condensed consolidated statements of operations which amounted to a benefit of $(2,371) for the three months ended March 31, 2018. A Monte Carlo simulation model was used to estimate the aggregate fair value of the Replacement Warrants as of March 31, 2018. Input assumptions used were as follows: risk-free interest rate of 2.45 percent; expected volatility of 50 percent; expected life of 3.64 years; and expected dividend yield of 0 percent. The underlying stock price used in the analysis was on a non-marketable basis and was according to a separate independent third-party valuation analysis since there was no active trading market for the Company’s common stock *Additional Warrants* Each Additional Warrant grants the holder the option to purchase up to the number of shares of capital stock of the Company equal to the product obtained by multiplying (i) the outstanding principal amount of the Amended and Restated Short-Term Note held by such holder and (ii) 0.75; at a per share exercise price of $1.80. The Additional Warrants are exercisable commencing on the Conversion Date and expire on November 21, 2021. The exercise price and number of the shares issuable upon exercising the Additional Warrants are subject to adjustment in the event of any stock dividends and splits, reverse stock split, recapitalization, reorganization or similar transaction, as described therein. The Additional Warrants were deemed to be a free-standing instrument and were accounted for as equity as there were no variable terms. The Additional Warrants amounted to 189,750 shares as of both the March 12, 2018 amendment date and as of March 31, 2018 with terms that largely parallel the provisions of the Original Warrants except that the Additional Warrants are exercisable on the Conversion Date as opposed to the Short-Term Note Maturity Date and the expiration date was moved up to November 21, 2021 from July 31, 2023. The fair value differential between the Original Warrants and the Additional Warrants was a reduction of $22,624. The fair value change was recorded as a reduction to additional paid-in capital in the accompanying condensed balance sheets and was included as part of the extinguishment loss discussed further below. *Premium Conversion Derivative* Upon the March 2018 amendment, the Short-Term Notes contained a 125% conversion premium in the event that a Short Term Note Qualified Financing occurs at a price under $2.25 per common share. The Company determined that the redemption feature under the Short-Term Notes qualified as an embedded derivative and was reflected as a liability in the amount of $49,668 at the time of the March 12, 2018 amendment with a corresponding offset to extinguishment loss which is described further below. Subsequent to the amendment, the embedded derivative is accounted for separately on a fair market value basis. The Company recorded the fair value changes of the premium debt conversion derivative associated with the Short-Term Notes in the condensed consolidated statements of operations for an expense of $43 for the three months ended March 31, 2018. *Other* The March 2018 amendment resulted in a substantial modification to the Short-Term Notes whereby additional conversion features and warrant coverage were added. The Company recorded the Short-Term Note amendment under the provisions of extinguishment accounting. A loss on Short-Term Notes extinguishment in the accompanying condensed consolidated statements of operations for the three months ended March 31, 2018 was recorded in the amount of $186,220, which represented the difference between the carrying value of the Short-Term Notes over the combined fair values of the Short-Term Notes, premium conversion derivative, Replacement Warrant and Additional Warrants on the date of the amendment. The fair value decrease of the Short-Term Notes (inclusive of principal and interest, non-bifurcated embedded conversion feature and the Additional Warrants) relative to its adjusted carrying value at the time of the amendment was $1,170 which was recorded as a reduction to additional paid-in capital on the accompanying condensed balance sheets. Pursuant to the Short-Term Note subscription agreement, the Company is entitled to receive notice in the event a holder elects to sell or receives a bona fide offer for any portion of the Short-Term Notes and associated warrants, and the right to purchase the Short-Term Notes and associated warrants on the same terms as the proposed sale or bona fide offer, as applicable, as long as the Company exercises that right within 15 days of receiving written notice. The Company has granted subscribers indemnification rights with respect to its representations, warranties, covenants and agreements under the Short-Term Note subscription agreement. Unsecured Loans On March 20, 2018, the Company received cash proceeds from an unsecured loan, represented by a promissory note, for $115,000 from an existing stockholder. The loan is interest free and requires that the Company repay the principal in full on the earlier to occur of (i) March 20, 2019 or (ii) the closing of an equity round of financing of the Company that raises more than $3 million in gross proceeds. The loan includes customary events of default. Additionally, NeuroOne received a $50,000 short-term unsecured loan in November 2016 from the placement agent for its convertible promissory note financing (see Note 8 – Convertible Promissory Notes and Warrant Agreements). NeuroOne incurred no fees or interest costs for this temporary loan and it was repaid in full in February 2017.

NOTE 7 – Short-Term Promissory Notes and Unsecured Loan

Short-Term Promissory Notes

In August 2017, the Company’s Board of Directors (the “Board”) authorized, and the Company issued short-term unsecured and interest-free promissory notes (the “Short-Term Notes”) for aggregate gross proceeds of $253,000 prior to issuance costs of $3,030 which were discounted from the Short-Term Notes and were amortized ratably to interest expense over the original term of the Short-Term Notes up though November 2017. On November 30, 2017, the Short-Term Notes were amended to extend the maturity date from February 18, 2018 to July 31, 2018 and to increase warrant coverage to 189,750 common stock purchase warrants (“Original Warrants”). The Original Warrants had a term of 5 years and an exercise price of $1.80 and would have been immediately exercisable upon maturity of the Short-Term Notes prior to the amendment described below. The November 30, 2017 amendment resulted in a substantial modification to the Short-Term Notes and was accounted for under the provisions of extinguishment accounting.

The Short-Term Notes were subsequently amended and restated on March 12, 2018 (the “Amended and Restated Short-Term Notes”). The Amended and Restated Short-Term Notes became convertible promissory notes that bear interest at a fixed rate of 8% per annum and require the Company to repay the principal and accrued and unpaid interest thereon on the maturity date of July 31, 2018 (the “Short-Term Note Maturity Date”). Pursuant to the terms of each Amended and Restated Short-Term Note and a consent signed by the Company and each holder, the Original Warrants under the Short-Term Notes were modified whereby each subscriber received a replacement warrant (the “Replacement Warrant”) upon the issuance of the Amended and Restated Short-Term Note, in lieu of the Original Warrant. In addition, each holder was issued an additional warrant (the “Additional Warrant”).

If the Company raises more than $3,000,000 in an equity or equity-linked financing before July 31, 2018 (the “Short-Term Note Qualified Financing”), the outstanding principal and accrued interest (the “Outstanding Balance”) on the Amended and Restated Short-Term Notes shall automatically convert into the securities issued by the Company in the Short-Term Note Qualified Financing (the “New Round Stock”) based on the greater number of such securities resulting from either (i) the Outstanding Balance divided by $1.80 or (ii) the Outstanding Balance multiplied by 1.25, divided by the price paid per security in the Short-Term Note Qualified Financing. If a change of control transaction occurs prior to the earlier of a Short-Term Note Qualified Financing or the Short-Term Note Maturity Date, the Amended and Restated Short-Term Notes would, at the election of the holders of a majority of the outstanding principal of the Amended and Restated Short-Term Notes, either become payable on demand as of the closing date of such transaction or become convertible into shares of common stock immediately prior to such transaction at a price per share equal to the lesser of (i) the per share value of the common stock as determined by the Board as if in connection with the granting of stock-based compensation or in a private sale to a third party in an arms’ length transaction or (ii) at the per share consideration to be paid in such transaction. The date of a conversion under a Short-Term Note Qualified Financing or a change of control transaction under the terms of the Amended and Restated Short-Term Notes is referred to herein as the “Conversion Date”.

Replacement Warrants

Each Replacement Warrant grants the holder the option to purchase up to the number of shares of capital stock of the Company equal to the New Round Stock issued or issuable upon the conversion of the Amended and Restated Short-Term Note held by such holder at a per share exercise price equal to either (i) the actual per share price of New Round Stock if the Amended and Restated Short-Term Notes converted in connection with a Short-Term Note Qualified Financing or (ii) the price at which the Amended and Restated Short-Term Notes converted in connection with a change of control transaction. The Replacement Warrants are exercisable commencing on the Conversion Date and expire on November 21, 2021. The exercise price and number of the shares issuable upon exercising the Replacement Warrants are subject to adjustment in the event of any stock dividends and splits, reverse stock split, recapitalization, reorganization or similar transaction, as described therein.

The Replacement Warrants were deemed to be a free-standing instrument and were accounted for as a liability given the variable number of shares issuable in connection with a possible change of control conversion event. The Company recorded an initial liability of $137,722 upon issuance with an offset to extinguishment loss described further below. The fair value changes of the warrant liability associated with the Short-Term Notes are recorded at each reporting date in the condensed consolidated statements of operations which amounted to a benefit of $(2,371) for the three months ended March 31, 2018. A Monte Carlo simulation model was used to estimate the aggregate fair value of the Replacement Warrants as of March 31, 2018. Input assumptions used were as follows: risk-free interest rate of 2.45 percent; expected volatility of 50 percent; expected life of 3.64 years; and expected dividend yield of 0 percent. The underlying stock price used in the analysis was on a non-marketable basis and was according to a separate independent third-party valuation analysis since there was no active trading market for the Company’s common stock

Additional Warrants

Each Additional Warrant grants the holder the option to purchase up to the number of shares of capital stock of the Company equal to the product obtained by multiplying (i) the outstanding principal amount of the Amended and Restated Short-Term Note held by such holder and (ii) 0.75; at a per share exercise price of $1.80. The Additional Warrants are exercisable commencing on the Conversion Date and expire on November 21, 2021. The exercise price and number of the shares issuable upon exercising the Additional Warrants are subject to adjustment in the event of any stock dividends and splits, reverse stock split, recapitalization, reorganization or similar transaction, as described therein.

The Additional Warrants were deemed to be a free-standing instrument and were accounted for as equity as there were no variable terms. The Additional Warrants amounted to 189,750 shares as of both the March 12, 2018 amendment date and as of March 31, 2018 with terms that largely parallel the provisions of the Original Warrants except that the Additional Warrants are exercisable on the Conversion Date as opposed to the Short-Term Note Maturity Date and the expiration date was moved up to November 21, 2021 from July 31, 2023. The fair value differential between the Original Warrants and the Additional Warrants was a reduction of $22,624. The fair value change was recorded as a reduction to additional paid-in capital in the accompanying condensed balance sheets and was included as part of the extinguishment loss discussed further below.

Premium Conversion Derivative

Upon the March 2018 amendment, the Short-Term Notes contained a 125% conversion premium in the event that a Short Term Note Qualified Financing occurs at a price under $2.25 per common share. The Company determined that the redemption feature under the Short-Term Notes qualified as an embedded derivative and was reflected as a liability in the amount of $49,668 at the time of the March 12, 2018 amendment with a corresponding offset to extinguishment loss which is described further below. Subsequent to the amendment, the embedded derivative is accounted for separately on a fair market value basis. The Company recorded the fair value changes of the premium debt conversion derivative associated with the Short-Term Notes in the condensed consolidated statements of operations for an expense of $43 for the three months ended March 31, 2018.

Other

The March 2018 amendment resulted in a substantial modification to the Short-Term Notes whereby additional conversion features and warrant coverage were added. The Company recorded the Short-Term Note amendment under the provisions of extinguishment accounting. A loss on Short-Term Notes extinguishment in the accompanying condensed consolidated statements of operations for the three months ended March 31, 2018 was recorded in the amount of $186,220, which represented the difference between the carrying value of the Short-Term Notes over the combined fair values of the Short-Term Notes, premium conversion derivative, Replacement Warrant and Additional Warrants on the date of the amendment. The fair value decrease of the Short-Term Notes (inclusive of principal and interest, non-bifurcated embedded conversion feature and the Additional Warrants) relative to its adjusted carrying value at the time of the amendment was $1,170 which was recorded as a reduction to additional paid-in capital on the accompanying condensed balance sheets.

Pursuant to the Short-Term Note subscription agreement, the Company is entitled to receive notice in the event a holder elects to sell or receives a bona fide offer for any portion of the Short-Term Notes and associated warrants, and the right to purchase the Short-Term Notes and associated warrants on the same terms as the proposed sale or bona fide offer, as applicable, as long as the Company exercises that right within 15 days of receiving written notice. The Company has granted subscribers indemnification rights with respect to its representations, warranties, covenants and agreements under the Short-Term Note subscription agreement.

Unsecured Loans

On March 20, 2018, the Company received cash proceeds from an unsecured loan, represented by a promissory note, for $115,000 from an existing stockholder. The loan is interest free and requires that the Company repay the principal in full on the earlier to occur of (i) March 20, 2019 or (ii) the closing of an equity round of financing of the Company that raises more than $3 million in gross proceeds. The loan includes customary events of default.

Additionally, NeuroOne received a $50,000 short-term unsecured loan in November 2016 from the placement agent for its convertible promissory note financing (see Note 8 – Convertible Promissory Notes and Warrant Agreements). NeuroOne incurred no fees or interest costs for this temporary loan and it was repaid in full in February 2017.