Fair Value Measurement	12 Months Ended
Fair Value Measurement	Dec. 31, 2020
Fair Value Disclosures [Abstract]
Fair Value Measurement	4. Fair Value of Financial Instruments As of December 31, 2020, the Company had $66.3 million in financial assets held in money market accounts and $39.0 million held in marketable securities, both of which were classified as Level 1 in the fair value hierarchy. The Company measured these assets at fair value. The Company classified these assets as Level 1 because the values of these assets are determined using unadjusted quoted prices in active markets for identical assets. During the year ended December 31, 2020, the Company had $15,000 and $29,000 of net realized gains related to its money market accounts and marketable securities, respectively. As of December 31, 2019, the Company did not have any financial instruments classified as Level 1 in the fair value hierarchy. During the years ended December 31, 2020 and December 31, 2019, the Company did not maintain any assets or liabilities classified as Level 2 or Level 3 in the fair value hierarchy.

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.