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FAIR VALUE MEASUREMENT AND FINANCIAL INSTRUMENTS | 12 Months Ended
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Dec. 31, 2022
Fair Value Disclosures [Abstract] |
FAIR VALUE MEASUREMENT AND FINANCIAL INSTRUMENTS | FAIR VALUE MEASUREMENT AND FINANCIAL INSTRUMENTS The carrying values of cash and cash equivalents, restricted cash, prepaid expenses and other current assets, and accounts payable on the Company’s consolidated balance sheets approximated their fair values as of December 31, 2022 and 2021 due to their short-term nature. Certain of the Company’s financial instruments are measured at fair value using a three-level hierarchy that prioritizes the inputs used to measure fair value. This fair value hierarchy prioritizes the use of observable inputs and minimizes the use of unobservable inputs. The three levels of inputs used to measure fair value are as follows: Level 1: Inputs are quoted prices for identical instruments in active markets, Level 2: Inputs are quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; or model-derived valuations whose inputs are observable or whose significant value drivers are observable. Level 3: Inputs are unobservable and reflect the Company’s own assumptions, based on the best information available, including the Company’s own data. The following tables set forth the carrying amounts and fair values of the Company's financial instruments measured at fair value on a recurring basis as of December 31, 2022 and 2021 (in thousands):
| December 31, 2022
|  |  |  |  | Fair Value Measurement Based on
| Carrying Amount |  | Fair Value |  | Quoted Prices in Active Markets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Assets: |  |  |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |  |
Money market funds | $ | 76,728 |  |  | $ | 76,728 |  |  | $ | 76,728 |  |  | $ | — |  |  | $ | — |
Marketable securities: |  |  |  |  |  |  |  |  |
US government securities | $ | 49,431 |  |  | $ | 49,431 |  |  | $ | — |  |  | $ | 49,431 |  |  | $ | — |
US treasury securities | $ | 4,935 |  |  | $ | 4,935 |  |  | $ | — |  |  | $ | 4,935 |  |  | $ | — |
| December 31, 2021
|  |  |  |  | Fair Value Measurement Based on
| Carrying Amount |  | Fair Value |  | Quoted Prices in Active Markets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Assets: |  |  |  |  |  |  |  |  |
Money market funds (cash equivalents) | $ | 16,382 |  |  | $ | 16,382 |  |  | $ | 16,382 |  |  | $ | — |  |  | $ | — |
Liabilities: |  |  |  |  |  |  |  |  |
Contingent consideration - long term | $ | 52,000 |  |  | $ | 52,000 |  |  | $ | — |  |  | $ | — |  |  | $ | 52,000 |
The Company evaluates transfers between fair value levels at the end of each reporting period. There were no transfers of assets or liabilities between fair value levels during the year ended December 31, 2022. The Company considers valuations obtained from third party pricing sources when estimating the fair value of marketable securities. Contingent Consideration The estimated fair value of the Company’s contingent consideration was determined using probabilities of successful achievement of regulatory milestones and commercial sales, the period in which these milestones and sales are expected to be achieved ranging from 2025 to 2033, and the level of commercial sales of Vicineum then-forecasted for the United States, Europe, Japan, China, and other potential markets. Earnouts were determined using an earnout rate of 2% on all commercial net sales of Vicineum through December 2033. The discount rate applied to the 2% earnout was derived from its estimated weighted-average cost of capital, which was 9.3% as of December 31, 2021. Milestone payments constitute debt-like obligations, and therefore a high-yield debt index rate was applied to the milestones in order to determine the estimated fair value. This index rate was 8.0% as of December 31, 2021. The following table sets forth a summary of the change in the fair value of the Company's total contingent consideration liability, measured on a recurring basis at each reporting period, for the year ended December 31, 2022.
Balance at December 31, 2021 | $ | 52,000 |
Change in fair value of contingent consideration - long term | (52,000) |
Balance at December 31, 2022 | $ | — |
The fair value of the Company’s contingent consideration is determined based on the present value of projected future cash flows associated with sales-based milestones and earnouts on net sales and is heavily dependent on discount rates to estimate the fair value at each reporting period. Earnouts are determined using an earnout rate of 2% on all commercial net sales of Vicineum through December 2033. The discount rate applied to the 2% earnout is derived from the Company’s weighted average cost of capital, which was 9.3% as of December 31, 2021. Milestone payments constitute debt-like obligations, and therefore a high-yield debt index rate is applied to the milestones in order to determine the estimated fair value. This index rate was 8.0% as of December 31, 2021. On July 15, 2022, the Company made the strategic decision to voluntarily pause further development of Vicineum in the United States. The decision was based on a thorough reassessment of Vicineum following discussions with the FDA, which had implications on the size, timeline, and costs of an additional Phase 3 clinical trial for the treatment of NMIBC. The Company continues to believe that Vicineum has benefits for patients and healthcare providers that can be maximized through a company with a larger infrastructure, and as such, it is seeking a partner for the further development of Vicineum. Accordingly, the Company concluded that it is no longer expected to pay related milestone and earnout payments to the former shareholders of Viventia. Therefore, the Company’s contingent consideration liability as of December 31, 2022 was 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 https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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