Basis of Presentation (Policies)	12 Months Ended
Basis of Presentation (Policies)	Dec. 31, 2014
Accounting Policies [Abstract]
Basis of Presentation and Management's Plans	*Basis of Presentation and Management’s Plans* – The accompanying financial statements were prepared in conformity with accounting principles generally accepted in the United States of America (US GAAP).
Liquidity	*Liquidity* – At December 31, 2014, the Company had an accumulated deficit of approximately $46.5 million and cash and cash equivalents of approximately $8.5 million. On May 7, 2014, the Company closed its Initial Public Offering, in which 1,500,000 shares of common stock were sold at a price to the public of $8.00 per share for an aggregate offering price of $12.0 million. The offer and sale of all of the shares in the Initial Public Offering were registered under the Securities Act of the 1933, as amended, pursuant to a registration statement on Form S-1 (File No. 333-193204), which was declared effective by the SEC on May 1, 2014. The offering commenced as of May 1, 2014 and did not terminate before all of the securities registered in the registration statement were sold. Aegis Capital Corp. acted as the sole manager of the offering and as representative of the underwriters. The Company raised approximately $10.1 million in net proceeds after deducting underwriting discounts and commissions of $0.8 million, $1.0 million in prepaid offering and printing costs and other offering costs of $0.2 million. On January 15, 2015, the Company sold, in a private placement, an aggregate of approximately 1.1 million shares of common stock at a price of $7.00 per share. Investors received warrants to purchase up to approximately 1.1 million shares of common stock at an exercise price of $9.50. The warrants will expire 3 years from the date of issuance. The warrants do not include a net-exercise feature. The warrants may be redeemed by the Company at a price of $0.001 per share upon notice to the holders in the event that the closing bid for Aldeyra’s common stock for each of the fifteen consecutive trading days prior to such redemption is at least $20.00 per share and the average trading volume of Aldeyra’s common stock during such period is 50,000 shares per day. Following Aldeyra’s notification to the warrant holders of its exercise of the redemption right under the warrants, each warrant holder will have the option to exercise their warrants prior to the redemption date rather than having them redeemed. The Company raised approximately $7.1 million in net proceeds in the private placement of common stock and warrants. On January 22, 2015, in a subsequent private placement, the Company sold an aggregate of 211,528 shares of common stock at a price of $9.33 per share and a warrant to purchase up to 211,528 shares of common stock at a price of $0.125 per share subject to the warrant. The exercise price of the warrant is $9.50 per share. The warrant will expire 3 years from the date of issuance. The warrant does not include a net-exercise feature. The warrant may be redeemed by the Company at a price of $0.001 per share upon notice to the holder thereof in the event that the closing bid for Aldeyra’s common stock for each of the fifteen consecutive trading days prior to such redemption is at least $20.00 per share and the average trading volume of Aldeyra’s common stock during such period is 50,000 shares per day. Following Aldeyra’s notification to the warrant holder of its exercise of the redemption right under the warrant, the warrant holder will have the option to exercise the warrant prior to the redemption date rather than having it redeemed. The company raised approximately $2.0 million in net proceeds in the private placement of common stock and a warrant to purchase common stock. In addition, as discussed in Note 7, in November 2014, the Company amended its credit facility (the Credit Facility) with Square 1. Square 1 agreed to make term loans in a principal amount of up to $5,000,000 available to the Company with proceeds to be used first to refinance outstanding loans from Square 1, second to fund expenses related to the Company’s clinical trials, and the remainder for general working capital purposes. The term loans are to be made available to the Company upon the following terms: (i) $2,000,000 was made available on November 10, 2014; and (ii) $3,000,000 (the Tranche B Loan) is to be made available to the Company following the satisfaction of certain conditions, including receipt of positive phase 2 data in either SLS or noninfectious anterior uveitis. Each term loan accrues interest from its date of issue at a variable annual interest rate equal to the greater of 2.0% plus prime or 5.25% per annum. Any term loan made is payable as interest-only prior to November 2015 and thereafter is payable in monthly installments of principal plus accrued interest over 36 months. The Credit Facility is collateralized by the Company’s assets, including its intellectual property. The Company’s management believes that its currently available resources, including funds obtained from the January 2015 private placements and amounts available under the Credit Facility, will provide sufficient funds to enable the Company to meet its obligations through at least the end of 2016. The Company will need to raise additional capital to implement its near-term business plan. Additional funding may not be available to the Company on acceptable terms, or at all. If the Company is unable to secure additional capital, or meet financial covenants that could be implemented under the Company’s term loans in certain circumstances, it will be required to significantly decrease the amount of planned expenditures, and may be required to cease operations. Curtailment of operations would cause significant delays in the Company’s efforts to introduce its products to market, which is critical to the realization of its business plan and the future operations of the Company.
Use of Estimates	*Use of Estimates* – The preparation of financial statements in conformity with US GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, and the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of expenses during the reporting period. The Company evaluates its estimates and assumptions on an ongoing basis. The most significant estimates in the Company’s financial statements relate to accruals, including research and development costs, accounting for income taxes and the related valuation allowance, estimating the fair value of the Company’s common and preferred stock, preferred stock warrants, purchase rights and warrant purchase rights, and accounting for stock based compensation and the related fair value. Although these estimates are based on the Company’s knowledge of current events and actions it may undertake in the future, actual results may ultimately materially differ from these estimates and assumptions.
Segment Information	*Segment Information* – Operating segments are defined as components of an enterprise about which separate discrete information is available for evaluation by the chief operating decision maker, or decision-making group, in deciding how to allocate resources and in assessing performance. The Company views its operations and manages its business in one segment, which is the identification and development of a treatment for diseases related to high levels of free aldehydes.
Cash and Cash Equivalents	*Cash and Cash Equivalents* – The Company considers all investments purchased with an original maturity of three months or less when acquired to be cash equivalents.
Fair Value of Financial Instruments	*Fair Value of Financial Instruments* – Financial instruments including cash and cash equivalents approximate their fair value based on the short maturities of those instruments. The carrying amount of the Company’s term loans under its credit facility approximates market rates currently available to the Company. The fair value of our derivative instruments, including warrants and forms of preferred stock purchase rights, are more fully described in Note 4.
Concentration of Credit Risk	*Concentration of Credit Risk* – The Company’s financial instruments that are exposed to concentrations of credit risk consist primarily of cash and cash equivalents. Substantially all of the Company’s cash is held at one financial institution that management believes to be of high-credit quality. Deposits with these financial institutions may exceed the amount of insurance provided on such deposits; however, these deposits may be redeemed upon demand and, therefore, bear minimal risk.
Intellectual Property	*Intellectual Property* – The legal and professional costs incurred by the Company to acquire its patent rights are expensed as incurred and included in operating expenses. At December 31, 2014 and 2013, the Company has determined that these expenses have not met the criteria to be capitalized. Intellectual property related expenses for the years ended December 31, 2014 and 2013 were $184,517 and $189,965, respectively.
Income Taxes	*Income Taxes* – The Company follows the provisions of FASB ASC 740, Income Taxes, in reporting deferred income taxes. ASC 740 requires a company to recognize deferred tax liabilities and assets for expected future income tax consequences of events that have been recognized in the Company’s financial statements. Under this method, deferred tax assets and liabilities are determined based on temporary differences between financial statement carrying amounts and the tax basis of assets and liabilities using enacted tax rates in the years in which the temporary differences are expected to reverse. Valuation allowances are provided if based on the weight of available evidence, it is more likely than not that some or all of the deferred tax assets will not be realized. The Company accounts for uncertain tax positions pursuant to ASC 740 which prescribes a recognition threshold and measurement process for financial statement recognition of uncertain tax positions taken or expected to be taken in a tax return. If the tax position meets this threshold, the benefit to be recognized is measured as the tax benefit having the highest likelihood of being realized upon ultimate settlement with the taxing authority. The Company recognizes interest accrued related to unrecognized tax benefits and penalties in the provision for income taxes. Management is not aware of any uncertain tax positions.
Research and Development Costs	*Research and Development Costs* – Research and development costs are charged to expense as incurred. Research and development expenses include consulting expenses, preclinical studies, clinical trials, clinical trial materials, regulatory and clinical consultants, lab supplies, lab services, lab equipment maintenance and small equipment purchased to support the research laboratory. Research and development costs that are paid in advance of performance are capitalized as a prepaid expense until incurred.
Stock-Based Compensation	*Stock-Based Compensation* – Stock-based payments are accounted for in accordance with the provisions of ASC 718, Compensation – Stock Compensation. For options, the fair value of stock-based payments is estimated, on the date of grant, using the Black-Scholes option pricing model. For restricted stock, fair value is based on the fair value of the stock on the date of grant. The resulting fair value for restricted stock and options is recognized ratably over the requisite service period, which is generally the vesting period of the applicable restricted stock or option. Equity instruments issued to nonemployees are accounted for under the provisions of ASC 718 and ASC 505-50, Equity – Equity-Based Payments to Non-Employees. Accordingly, the estimated fair value of the equity instrument is recorded on the earlier of the performance commitment date or the date the services are completed and are marked to market through the date of vesting. From time to time the Company may grant awards with performance conditions necessary to be achieved in order to vest in the award. The company records compensation expense for those awards over the vesting period of the award to the extent the performance conditions are deemed probable of achievement. From time to time the Company may grant awards with a market condition necessary to be achieved in order to vest in the award. The Company records compensation expense for those awards over the vesting period of the award on a straight-line basis utilizing Monte Carlo simulations to estimate the timing and number of shares that are most likely to vest.
Comprehensive (Loss) Income	*Comprehensive (Loss) Income* – Comprehensive (loss) income is defined as the change in equity (deficit) during a period from transactions and other events and/or circumstances from non-owner sources. For all periods presented, comprehensive (loss) income is equal to net (loss) income.
Net (Loss) Income Applicable to Common Stock	*Net (Loss) Income Applicable to Common Stock* – The Company computes net (loss) income per share in accordance with the two-class method. Under the two-class method, net income is allocated between common stock and other participating securities based on their participation rights. The Company has determined that their outstanding Series A and Series B Preferred Stock represents a participating security and as such the preferred shares are excluded from basic earnings per share. Net losses are not allocated to the preferred stockholders for computing net loss per share under the two-class method because preferred stockholders do not have contractual obligations to share in the losses of the Company. Basic earnings per share is calculated by dividing income allocable to common stockholders (after reduction for preferred stock dividends assuming current income for the period had been distributed) by the weighted average number of common stock outstanding. Diluted net (loss) income per share is computed using the more dilutive of (a) the two-class method, or (b) the if-converted method or treasury stock method, as applicable, to the potentially dilutive instruments. The Company allocates net income first to preferred stockholders based on dividend rights and then to common and preferred stockholders based on ownership interests. The weighted-average number of common shares outstanding gives effect to all potentially dilutive common equivalent shares, including outstanding stock options and restricted stock, warrants, rights to purchase additional shares of preferred stock, rights for warrants to purchase preferred stock and convertible debt.
Recent Accounting Pronouncements	*Recent Accounting Pronouncements* – In August 2014, the FASB issued Accounting Standards Update (ASU) No. 2014-15, Going Concern (ASU 2014-15). ASU 2014-15 provides GAAP guidance on management’s responsibility in evaluating whether there is substantial doubt about a company’s ability to continue as a going concern and about related footnote disclosures. For each reporting period, management will be required to evaluate whether there are conditions or events that raise substantial doubt about a company’s ability to continue as a going concern within one year from the date the financial statements are issued. The standard will be effective for annual periods ending after December 15, 2016, and interim periods within annual periods beginning after December 15, 2016. Early application is permitted for annual or interim reporting periods for which the financial statements have not previously been issued. Upon adoption the Company will use the guidance in ASU 2014-15 to assess going concern. In June 2014, the Financial Accounting Standards Board (FASB) amended its guidance on development stage entities ASU No. 2014-10Development Stage Entities (Topic 915); Elimination of Certain Financial Reporting Requirements, Including an Amendment to Variable Interest Entities, Guidance in Topic 810, Consolidation (ASU 2014-10). The amendment removed all incremental financial reporting requirements from GAAP for development stage entities. ASU 2014-10 is effective for interim and annual periods beginning after December 15, 2014, with early adoption permitted. The Company adopted this guidance in the quarterly period ended June 30, 2014. Prior to the Company’s adoption of this guidance, the Company was a development stage entity because it devoted substantially all of its efforts to research and development of products to treat diseases for which planned principal operations have not commenced. The adoption of this guidance did not have a material impact on the Company’s financial position, results of operations or cash flows other than the removal of inception-to-date information about income statement line items, cash flows, and equity transactions. In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (ASU 2014-09). The amendments in ASU 2014-09 provide for a single, principles-based model for revenue recognition that replaces the existing revenue recognition guidance. ASU 2014-09 is effective for annual and interim periods beginning on or after December 15, 2016 and will replace most existing revenue recognition guidance under GAAP when it becomes effective. It permits the use of either a retrospective or cumulative effect transition method and early adoption is not permitted. As the Company has not generated revenues, the Company has not yet selected a transition method and is in the process of evaluating the effect this standard will have on its financial statements and related disclosures.
Fair Value Measurements	Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Valuation techniques used to measure fair value are performed in a manner to maximize the use of observable inputs and minimize the use of unobservable inputs. ASC 820, Fair Value Measurements, establishes a fair value hierarchy based on three levels of inputs, of which the first two are considered observable and the last unobservable, that may be used to measure fair value, which are the following: Level 1 – Quoted prices in active markets that are accessible at the market date for identical unrestricted assets or liabilities. Level 2 – Inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs for which all significant inputs are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Level 3 – Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.