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Debt | 6 Months Ended
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Jun. 30, 2025
Debt Disclosure [Abstract] |
Debt | Debt Liability for the Sale of Future Revenues On October 3, 2024, the Company entered into a purchase and sale agreement (the “Purchase and Sale Agreement”) with DRI under which it sold, transferred, assigned, and conveyed to DRI certain future license fees and other payments (the “Purchased Receivables”) owed to the Company by Vertex under the terms of the Vertex License Agreement in exchange for an upfront cash payment by DRI to the Company of $57.0 million. Under the Purchase and Sale Agreement, DRI is purchasing up to 100% of certain future fixed and sales-based annual license fees owed to the Company under the Vertex License Agreement, which fees range from $5.0 million to $40.0 million per year (inclusive of certain sales-based annual license fee increases) and a mid-double-digit percentage of a $50.0 million contingent upfront payment that the Company may receive under the Vertex License Agreement, in each case after subtracting amounts that will be owed by the Company to Broad and Harvard (each term as defined in Note 8, respectively). The Company has retained rights to its portions of certain other sales-based annual license fees and the contingent upfront payment that may become due under the Vertex License Agreement, and the amounts that correspond to its licensor obligations. In accordance with Accounting Standards Codification (“ASC”) Topic 470, Borrower’s Accounting for Debt Modification, the Company has accounted for the transaction as debt. The gross proceeds of $57.0 million were recorded as a liability for the sale of future revenues, net of transaction costs of $1.8 million, which will be amortized over the estimated life of the arrangement using the effective interest method. The Company estimates the effective interest rate used to record non-cash interest expense under the Purchase and Sale Agreement based on the estimate of future revenue payments to be made to DRI. As of June 30, 2025, the estimated effective interest rate under the agreement was 15.1%. Over the life of the arrangement, the actual effective interest rate will be affected by the amount and timing of the payments made to DRI and changes in the Company's revenue forecasts. At each reporting date, the Company will reassess its estimate of total future payments to be made to DRI, and prospectively adjust the effective interest rate and amortization of the liability as necessary. The following table presents the changes in the liability related to the sale of future revenues under the Purchase and Sale Agreement with DRI as of June 30, 2025 (in thousands):
| June 30, 2025
Deferred royalty obligation related to the sale of future revenues, net as of December 31, 2024 | $ | 57,434 |
Payments for sale of future revenues | (5,000) |
Non-cash interest expense associated with sale of future revenues | 4,117 |
Amortization of issuance costs | 119 |
Deferred royalty obligation related to the sale of future revenues, net as of June 30, 2025 | $ | 56,670 |

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- Definition The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8A -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-8A Reference 2: http://www.xbrl.org/2003/role/disclosureRef 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