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Fair Value Measurements | 3 Months Ended
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Mar. 31, 2023
Fair Value Disclosures [Abstract] |
Fair Value Measurements | 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 must maximize the use of observable inputs and minimize the use of unobservable inputs. The three-level hierarchy for the inputs to valuation techniques is briefly summarized as follows:
Level 1 – | Valuations are based on quoted prices in active markets for identical assets or liabilities and readily accessible by us at the reporting date.
Level 2 – | Valuations based on 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 that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.
Level 3 – | Valuations based on unobservable inputs for which there is little or no market data, which require us to develop our own assumptions.
The following table sets forth the fair value of our financial assets and liabilities that are measured or disclosed on a recurring basis by level within the fair value hierarchy (in thousands):
| March 31, 2023
| Total Fair Value |  | Level 1 |  | Level 2 |  | Level 3
Assets: |  |  |  |  |  |  |
Money market funds | $ | 84,501 |  |  | $ | 84,501 |  |  | $ | — |  |  | $ | — |
Commercial paper | 23,333 |  |  | — |  |  | 23,333 |  |  | — |
U.S. government-sponsored agency bonds | 12,620 |  |  | — |  |  | 12,620 |  |  | — |
Asset-backed securities | 1,933 |  |  | — |  |  | 1,933 |  |  | — |
Total | $ | 122,387 |  |  | $ | 84,501 |  |  | $ | 37,886 |  |  | $ | — |
Liabilities: |  |  |  |  |  |  |
Derivative liabilities for exit fees | $ | 1,726 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,726 |
Total | $ | 1,726 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,726 |
| December 31, 2022
| Total Fair Value |  | Level 1 |  | Level 2 |  | Level 3
Assets: |  |  |  |  |  |  |
Money market funds | $ | 84,313 |  |  | $ | 84,313 |  |  | $ | — |  |  | $ | — |
Commercial paper | 25,291 |  |  | — |  |  | 25,291 |  |  | — |
Corporate bonds | 999 |  |  | — |  |  | 999 |  |  | — |
U.S. government-sponsored agency bonds | 1,479 |  |  | — |  |  | 1,479 |  |  | — |
Total | $ | 112,082 |  |  | $ | 84,313 |  |  | $ | 27,769 |  |  | $ | — |
Liabilities: |  |  |  |  |  |  |
Derivative liability for exit fee | $ | 1,656 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,656 |
Total | $ | 1,656 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,656 |
Where quoted prices are available in an active market, securities are classified as Level 1. We classify money market funds as Level 1. When quoted market prices are not available for the specific security, we estimate fair value by using benchmark yields, reported trades, broker/dealer quotes and issuer spreads. We classify U.S. government-sponsored agency bonds, U.S. treasury notes, corporate bonds, commercial paper, and asset-backed securities as Level 2. In certain cases, where there is limited activity or less transparency around inputs to valuation, securities or derivative liabilities, such as the 2018 Exit Fee and the 2022 Exit Fee, as defined and discussed in Note 9. Derivative Liabilities, are classified as Level 3. The carrying amounts reflected in the condensed balance sheets for cash equivalents, short-term investments, accounts receivable, prepaid expenses and other current assets, accounts payable and accrued expenses approximate their fair values at both March 31, 2023 and December 31, 2022, due to their short-term nature. Based on our procedures under the expected credit loss model, including an assessment of unrealized losses in our portfolio, we concluded that any unrealized losses on our marketable securities were not attributable to credit and, therefore, we have not recorded an allowance for credit losses for these securities as of March 31, 2023 and December 31, 2022. Fair Value of Debt The principal amount outstanding under our term loan facilities is subject to a variable interest rate. Therefore, we believe the carrying amount of the term loan facility approximates fair value as of March 31, 2023 and December 31, 2022. See Note 8. Borrowing for a description of the Level 2 inputs used to estimate the fair value of the liability. The carrying value of the deferred royalty obligation related to the sale of future royalties approximates its fair value as of March 31, 2023 and December 31, 2022 and is based on our current estimates of future royalties and commercialization milestones expected to be paid to us by Kyowa Kirin Co., Ltd. ("Kyowa Kirin") over the life of the agreement. See Note 7. Deferred Royalty Obligation Related to the Sale of Future Royalties for a description of the Level 3 inputs used to estimate the fair value of the liability.

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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 https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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