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Fair Value of Financial Instruments | 3 Months Ended
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Mar. 31, 2021
Fair Value Disclosures [Abstract] |
Fair Value of Financial Instruments | 3. Fair Value of Financial Instruments The following tables summarize the Company’s assets that require fair value measurements on a recurring basis and their respective input levels based on the fair value hierarchy (in thousands):
|  |  |  |  | Fair Value Measurements Using |
|  |  |  |  | Quoted Prices in |  |  | Significant |  |  | Significant |
|  |  |  |  | Active Markets |  |  | Other |  |  | Unobservable |
|  | March 31, |  |  | for Identical |  |  | Observable |  |  | Inputs |
|  | 2021 |  |  | Assets (Level 1) |  |  | Inputs (Level 2) |  |  | (Level 3) |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 52,727 |  |  | $ | 52,727 |  |  | $ | - |  |  | $ | - |
Certificates of deposit |  |  | 491 |  |  |  | 491 |  |  |  | - |  |  |  | - |
Total |  | $ | 53,218 |  |  | $ | 53,218 |  |  | $ | - |  |  | $ | - |
|  |  |  |  | Fair Value Measurements Using |
|  |  |  |  | Quoted Prices in |  |  | Significant |  |  | Significant |
|  |  |  |  | Active Markets |  |  | Other |  |  | Unobservable |
|  | December 31, |  |  | for Identical |  |  | Observable |  |  | Inputs |
|  | 2020 |  |  | Assets (Level 1) |  |  | Inputs (Level 2) |  |  | (Level 3) |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 56,220 |  |  | $ | 56,220 |  |  | $ | - |  |  | $ | - |
Certificates of deposit |  |  | 1,961 |  |  |  | 1,961 |  |  |  | - |  |  |  | - |
Total |  | $ | 58,181 |  |  | $ | 58,181 |  |  | $ | - |  |  | $ | - |
U.S. treasury securities and certificates of deposit are valued using Level 1 inputs. Level 1 securities are valued at unadjusted quoted prices in active markets that are observable at the measurement date for identical, unrestricted assets or liabilities. Fair values determined by Level 2 inputs, which utilize data points that are observable such as quoted prices, interest rates and yield curves, require the exercise of judgment and use of estimates, that if changed, could significantly affect the Company’s financial position and results of operations. Investments in agency securities are valued using Level 2 inputs. Level 2 securities are initially valued at the transaction price and subsequently valued and reported utilizing inputs other than quoted prices that are observable either directly or indirectly, such as quotes from third-party pricing vendors. The carrying amounts of the Company’s financial instruments, including cash, prepaid and other current assets, accounts payable, and accrued liabilities, approximate fair value due to their short maturities. The carrying amount of the Company’s notes payable of $10.0 million at March 31, 2021 approximated their fair value as the terms of the notes are consistent with the market terms of transactions with similar profiles (Level 2 inputs). None of the Company’s non-financial assets or liabilities are recorded at fair value on a non-recurring basis. At March 31, 2021 and December 31, 2020, the Company had investments in money market funds of $42.4 million and $17.4 million, respectively, that were measured at fair value using the net asset value per share (or its equivalent) that have not been classified in the fair value hierarchy. The funds invest primarily in U.S. government securities. The Company did not hold any Level 1, 2 or 3 financial liabilities that are recorded at fair value on a recurring basis as of March 31, 2021 or December 31, 2020.

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- 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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