Fair Value Measurements	9 Months Ended
Sep. 30, 2021
Fair Value Disclosures [Abstract]
Fair Value Measurements	3. Fair Value Measurements The Company did not have financial assets and liabilities measured at fair value at September 30, 2021 and December 31, 2020. There have been no changes to the valuation methods used during the three and nine months ended September 30, 2021 and 2020. There were no transfers within the fair value hierarchy during the three and nine months ended September 30, 2021 and 2020. The carrying values of the Company’s cash and cash equivalents, accounts payable and accrued expenses approximate their fair values due to the short-term nature of these assets and liabilities. In connection with the Company’s sale of Series C redeemable convertible preferred stock (“Series C Preferred Stock”) in January 2020, the Company issued to investors warrants for the purchase of common stock (“Warrants”). The proceeds from the issuance of the Series C Preferred Stock were allocated between the Series C Preferred Stock and Warrants based on their relative fair values at the time of issuance.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

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