FA212 Asset Acquisition	3 Months Ended
Mar. 31, 2025
Asset Acquisition [Abstract]
FA212 Asset Acquisition	2. FA212 Asset Acquisition On September 19, 2024, the Company entered into an asset purchase agreement with FA212 LLC ("FA212") for the purchase of certain intellectual property, including patents and assigned licenses related to a pre-clinical drug candidate, which the Company now refers to as SGT-212, assigned manufacturing contracts as well as research and development materials such as manufactured materials and samples. The Company paid FA212 an upfront payment of $1.0 million in the third quarter of 2024. Additionally, the Company agreed to pay FA212 development milestone payments of up to $34.0 million, cumulative sales milestone payments of up to $21.0 million, and tiered royalties on net sales in the low-single-digits. The Company also assumed from FA212 contingent development milestone payments of up to $4.2 million, regulatory milestone payments of up to $13.0 million, cumulative sales milestone payments of up to $27.5 million, and tiered royalties on worldwide net sales in the mid-single digits payable to the University of Pennsylvania. Certain development milestone payments to FA212 are payable in either cash, equity, or a combination of both, at the Company's discretion. Such contingent payments were determined to be derivative liabilities and were initially recorded at their fair value of $3.4 million. The Company determined that the FA212 agreement represented an asset acquisition of IPR&D assets with no alternative future use and recognized the aggregate acquisition cost of $5.1 million as research and development expense in the third quarter of 2024, which included the upfront payment, initial recognition of the derivative liability and $0.7 million in transaction costs. The Company submitted an investigational new drug application ("IND") for SGT-212 for the treatment of FA to the U.S. Food and Drug Administration ("FDA"), which was cleared in December 2024. Upon clearance of the IND, the first development milestone of $5.0 million became payable to FA212. The $5.0 million milestone payment is included in Accrued expenses and other current liabilities in the accompanying condensed consolidated balance sheet as of December 31, 2024. On February 28, 2025, the Company made the first development milestone payment in the form of 975,496 shares of its common stock. The derivative liabilities for the remaining contingent payments were recorded at a fair value of $4.8 million and $3.2 million as of March 31, 2025 and December 31, 2024, respectively. See Note 3 - Fair Value Measurements.

FA212 Asset Acquisition

3 Months Ended

Mar. 31, 2025

2. FA212 Asset Acquisition

On September 19, 2024, the Company entered into an asset purchase agreement with FA212 LLC ("FA212") for the purchase of certain intellectual property, including patents and assigned licenses related to a pre-clinical drug candidate, which the Company now

refers to as SGT-212, assigned manufacturing contracts as well as research and development materials such as manufactured materials and samples.

The Company paid FA212 an upfront payment of $1.0 million in the third quarter of 2024. Additionally, the Company agreed to pay FA212 development milestone payments of up to $34.0 million, cumulative sales milestone payments of up to $21.0 million, and tiered royalties on net sales in the low-single-digits. The Company also assumed from FA212 contingent development milestone payments of up to $4.2 million, regulatory milestone payments of up to $13.0 million, cumulative sales milestone payments of up to $27.5 million, and tiered royalties on worldwide net sales in the mid-single digits payable to the University of Pennsylvania.

Certain development milestone payments to FA212 are payable in either cash, equity, or a combination of both, at the Company's discretion. Such contingent payments were determined to be derivative liabilities and were initially recorded at their fair value of $3.4 million.

The Company determined that the FA212 agreement represented an asset acquisition of IPR&D assets with no alternative future use and recognized the aggregate acquisition cost of $5.1 million as research and development expense in the third quarter of 2024, which included the upfront payment, initial recognition of the derivative liability and $0.7 million in transaction costs.

The Company submitted an investigational new drug application ("IND") for SGT-212 for the treatment of FA to the U.S. Food and Drug Administration ("FDA"), which was cleared in December 2024. Upon clearance of the IND, the first development milestone of $5.0 million became payable to FA212. The $5.0 million milestone payment is included in Accrued expenses and other current liabilities in the accompanying condensed consolidated balance sheet as of December 31, 2024. On February 28, 2025, the Company made the first development milestone payment in the form of 975,496 shares of its common stock. The derivative liabilities for the remaining contingent payments were recorded at a fair value of $4.8 million and $3.2 million as of March 31, 2025 and December 31, 2024, respectively. See Note 3 - Fair Value Measurements.