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Fair Value Measurements | 6 Months Ended
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Jun. 30, 2021
Fair Value Disclosures [Abstract] |
Fair Value Measurements | 4. Fair Value Measurements The Company determines the fair value of financial and non-financial assets and liabilities using the fair value hierarchy which establishes three level of inputs that may be used to measure fair value, as follows: Level 1 — Observable inputs, such as quoted prices in active markets for identical assets or liabilities. Level 2 — Observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Level 3 — Unobservable inputs which reflect management’s best estimate of what market participants would use in pricing the asset or liability at the measurement date. Consideration is given to the risk inherent in the valuation technique and the risk inherent in the inputs to the model. In determining fair value, the Company utilizes valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs to the extent possible as well as considers counterparty credit risk in its assessment of fair value. Assets and liabilities measured at fair value are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. The Company’s assessment of the significance of a particular input to the fair value measurement in its entirety requires management to make judgments and consider factors specific to the asset or liability. The following tables present information about the Company’s financial assets and liabilities measured at fair value on a recurring basis and indicate the level of the fair value hierarchy utilized to determine such fair values (in thousands):
|  | June 30, 2021 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Assets: |  |  |  |  |  |  |  |  |  |  |  |
Money market funds (1) |  | $ | 204,949 |  |  | $ | — |  |  | $ | — |  |  | $ | 204,949 |
Total fair value of assets |  | $ | 204,949 |  |  | $ | — |  |  | $ | — |  |  | $ | 204,949 |
|  | December 31, 2020 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Assets: |  |  |  |  |  |  |  |  |  |  |  |
Money market funds (1) |  | $ | 63,817 |  |  | $ | — |  |  | $ | — |  |  | $ | 63,817 |
Marketable debt securities (2) |  |  |  |  |  |  |  |  |  |  |  |
Asset-backed securities |  |  | — |  |  |  | 7,522 |  |  |  | — |  |  |  | 7,522 |
Corporate debt securities |  |  | — |  |  |  | 1,762 |  |  |  | — |  |  |  | 1,762 |
Commercial paper |  |  | — |  |  |  | 1,000 |  |  |  | — |  |  |  | 1,000 |
Marketable debt securities |  |  | — |  |  |  | 10,284 |  |  |  | — |  |  |  | 10,284 |
Total fair value of assets |  | $ | 63,817 |  |  | $ | 10,284 |  |  | $ | — |  |  | $ | 74,101 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  | $ | — |  |  | $ | — |  |  | $ | 980 |  |  | $ | 980 |
Total fair value of liabilities |  | $ | — |  |  | $ | — |  |  | $ | 980 |  |  | $ | 980 |
(1) Included in cash and cash equivalents in the consolidated balance sheets. (2) Included in short-term marketable debt security in the consolidated balance sheets. Money market funds are included within Level 1 of the fair value hierarchy because they are valued using quoted market prices. Corporate debt securities, U.S. government agency bonds, commercial paper and asset-backed securities are classified within Level 2 of the fair value hierarchy as they take into consideration valuations obtained from third-party pricing services. The pricing services utilize industry standard valuation models, including both income-based and market-based approaches, for which all significant inputs are observable, either directly or indirectly, to estimate the fair value. These inputs include reported trades of and broker/dealer quotes on the same or similar securities, issuer credit spreads, benchmark securities, prepayment/default projections based on historical data and other observable inputs. As part of the acquisition of resTORbio, the Company entered into a CVR Agreement and recorded the fair value of the CVR as part of consideration transferred. The Company considers the contingent consideration liability a Level 3 instrument (one with significant unobservable inputs) in the fair value hierarchy. In June 2021, the Company determined the possibility of any commercialization events for RTB101 was close to zero (see Note 3). As a result, the fair value of the CVR liability was adjusted to zero.

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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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