Commitments and Contingencies	6 Months Ended
Jun. 30, 2024
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	7. Commitments and Contingencies Leases Refer to Note 7 to the consolidated financial statements in the Company’s 2023 Annual Report on Form 10-K filed with the SEC on February 21, 2024 for discussion of the Company’s lease arrangements. Litigation In the ordinary course of business, the Company is from time to time involved in lawsuits, investigations, proceedings and threats of litigation related to, among other things, the Company’s intellectual property estate (including certain in-licensed intellectual property), commercial arrangements and other matters. Such proceedings may include quasi-litigation, inter partes administrative proceedings in the U.S. Patent and Trademark Office and the European Patent Office involving the Company’s intellectual property estate including certain in-licensed intellectual property. The outcome of any of the foregoing, regardless of the merits, is inherently uncertain. In addition, litigation and related matters are costly and may divert the attention of Company’s management and other resources that would otherwise be engaged in other activities. If the Company is unable to prevail in any such proceedings, the Company’s business, results of operations, liquidity and financial condition could be adversely affected. Letters of Credit As of June 30, 2024, the Company had restricted cash of $11.5 million, representing letters of credit securing the Company’s obligations under certain leased facilities. The letters of credit are secured by cash held in a restricted depository account and included in “Restricted cash” on the Company's condensed consolidated balance sheets as of June 30, 2024. Research, Manufacturing, License and Intellectual Property Agreements The Company has engaged several research institutions and companies to identify new delivery strategies and applications of the Company’s gene editing technology. The Company is also a party to a number of license agreements which require significant upfront payments and may be required to make future royalty payments and potential milestone payments from time to time. In addition, the Company is also a party to intellectual property agreements, which require maintenance and milestone payments from time to time. Further, the Company is a party to a number of manufacturing agreements that require upfront payments for the future performance of services. In association with these agreements, on a product-by-product basis, the counterparties are eligible to receive up to low eight-digit potential payments upon specified research, development and regulatory milestones. In addition, on a product-by-product basis, the counterparties are eligible to receive potential commercial milestone payments based on specified annual sales thresholds. The potential payments are low-single digit percentages of the specified annual sales thresholds. The counterparties are also eligible to receive low single-digit royalties on future net sales. Under certain circumstances and if certain contingent future events occur, Vertex is eligible to receive up to $395.0 million in potential specified research, development, regulatory and commercial milestones and tiered single-digit percentage royalties on future net sales related to a specified target under an amendment to the 2015 Collaboration Agreement (as such term is defined in Note 6 above). In addition, Vertex has the option to conduct research at its own cost in certain defined areas that, if beneficial to the CASGEVY program and ultimately achieves regulatory approval, could result in the Company owing Vertex certain milestone payments aggregating to high eight digits, subject to certain limitations on the profitability of the CASGEVY program. Under the A&R Vertex JDCA, the Company has an option to defer specified costs on the CASGEVY program in excess of $110.3 million for the years ended December 31, 2022, 2023 and 2024. Additionally, the Company is permitted, under certain specified circumstances as set forth in Amendment No. 1 to the A&R Vertex JDCA, to adjust the timing of and portion of the Company's share of costs it is permitted to defer under the agreement. The Company exercised its option to defer its share of costs incurred in 2022 and 2023 on the CASGEVY program in excess of the deferral limit under the A&R Vertex JDCA, which resulted in a deferral of $36.1 million and $80.9 million, respectively. As of June 30, 2024, $4.0 million of costs incurred in 2024 under the A&R Vertex JDCA, as amended, have been deferred. Any deferred amounts are only payable to Vertex as an offset against future profitability of the CASGEVY program and the amounts payable are capped at a specified maximum amount per year, subject to potential specified offsets. These deferred costs on the CASGEVY program will be accrued for when it is probable that a liability has been incurred and the amount can be reasonably estimated. As of June 30, 2024, no contingent payments have been accrued to date.

Commitments and Contingencies

6 Months Ended

Jun. 30, 2024

Commitments and Contingencies Disclosure [Abstract]

7. Commitments and Contingencies

Leases

Refer to Note 7 to the consolidated financial statements in the Company’s 2023 Annual Report on Form 10-K filed with the SEC on February 21, 2024 for discussion of the Company’s lease arrangements.

Litigation

In the ordinary course of business, the Company is from time to time involved in lawsuits, investigations, proceedings and threats of litigation related to, among other things, the Company’s intellectual property estate (including certain in-licensed intellectual property), commercial arrangements and other matters. Such proceedings may include quasi-litigation, inter partes administrative proceedings in the U.S. Patent and Trademark Office and the European Patent Office involving the Company’s intellectual property estate including certain in-licensed intellectual property. The outcome of any of the foregoing, regardless of the merits, is inherently uncertain. In addition, litigation and related matters are costly and may divert the attention of Company’s management and other resources that would otherwise be engaged in other activities. If the Company is unable to prevail in any such proceedings, the Company’s business, results of operations, liquidity and financial condition could be adversely affected.

Letters of Credit

As of June 30, 2024, the Company had restricted cash of $11.5 million, representing letters of credit securing the Company’s obligations under certain leased facilities. The letters of credit are secured by cash held in a restricted depository account and included in “Restricted cash” on the Company's condensed consolidated balance sheets as of June 30, 2024.

Research, Manufacturing, License and Intellectual Property Agreements

The Company has engaged several research institutions and companies to identify new delivery strategies and applications of the Company’s gene editing technology. The Company is also a party to a number of license agreements which require significant upfront payments and may be required to make future royalty payments and potential milestone payments from time to time. In addition, the Company is also a party to intellectual property agreements, which require maintenance and milestone payments from time to time. Further, the Company is a party to a number of manufacturing agreements that require upfront payments for the future performance of services.

In association with these agreements, on a product-by-product basis, the counterparties are eligible to receive up to low eight-digit potential payments upon specified research, development and regulatory milestones. In addition, on a product-by-product basis, the counterparties are eligible to receive potential commercial milestone payments based on specified annual sales thresholds. The potential payments are low-single digit percentages of the specified annual sales thresholds. The counterparties are also eligible to receive low single-digit royalties on future net sales.

Under certain circumstances and if certain contingent future events occur, Vertex is eligible to receive up to $395.0 million in potential specified research, development, regulatory and commercial milestones and tiered single-digit percentage royalties on future net sales related to a specified target under an amendment to the 2015 Collaboration Agreement (as such term is defined in Note 6 above). In addition, Vertex has the option to conduct research at its own cost in certain defined areas that, if beneficial to the CASGEVY program and ultimately achieves regulatory approval, could result in the Company owing Vertex certain milestone payments aggregating to high eight digits, subject to certain limitations on the profitability of the CASGEVY program.

Under the A&R Vertex JDCA, the Company has an option to defer specified costs on the CASGEVY program in excess of $110.3 million for the years ended December 31, 2022, 2023 and 2024. Additionally, the Company is permitted, under certain specified circumstances as set forth in Amendment No. 1 to the A&R Vertex JDCA, to adjust the timing of and portion of the Company's share of costs it is permitted to defer under the agreement.

The Company exercised its option to defer its share of costs incurred in 2022 and 2023 on the CASGEVY program in excess of the deferral limit under the A&R Vertex JDCA, which resulted in a deferral of $36.1 million and $80.9 million, respectively. As of June 30, 2024, $4.0 million of costs incurred in 2024 under the A&R Vertex JDCA, as amended, have been deferred. Any deferred amounts are only payable to Vertex as an offset against future profitability of the CASGEVY program and the amounts payable are capped at a specified maximum amount per year, subject to potential specified offsets. These deferred costs on the CASGEVY program will be accrued for when it is probable that a liability has been incurred and the amount can be reasonably estimated. As of June 30, 2024, no contingent payments have been accrued to date.