Subsequent Events	12 Months Ended
Dec. 31, 2023
Subsequent Events
Subsequent Events	Note 12. Subsequent Events The Company has further evaluated subsequent events for recognition and remeasurement purposes as of and for the twelve months ended December 31, 2023. After review and evaluation, management has concluded that there were no material subsequent events as of the date that the financial statements were available to be issued, except as discussed below. Termination of Forward Purchase Agreements On March 18, 2024, the Company and ACM ARRT J LLC (“ACM”) entered into a termination agreement (the “ACM Termination Agreement”) terminating that certain Forward Purchase Agreement, dated June 29, 2023, by and among the Company and ACM (the “ACM FPA”). The ACM Termination Agreement provides that (i) ACM will retain 3,100,000 previously issued shares of Common Stock held by ACM pursuant to the ACM FPA and its respective subscription agreement (the “ACM Retained Shares”) and (ii) the Company will be subject to up to $1,500,000 in liquidated damages if it fails to meet certain registration requirements for the ACM Retained Shares, subject to certain conditions set forth in the ACM Termination Agreement. ACM did not pay any cash to the Company for the ACM Retained Shares and retained all portions of the Prepayment Amount associated with the ACM Retained Shares. On March 18, 2024, the Company and Polar entered into a termination agreement (the “Polar Termination Agreement”) terminating that certain Forward Purchase Agreement, dated June 29, 2023, by and among the Company and Polar (the “Polar FPA”). The Polar Termination Agreement provides that (i) Polar will retain 3,175,000 previously issued shares of Common Stock held by Polar pursuant to the Polar FPA and its respective subscription agreement (the “Polar Retained Shares”) and (ii) the Company will be subject to up to $1,500,000 in liquidated damages if it fails to meet certain registration requirements for the Polar Retained Shares, subject to certain conditions set forth in the Polar Termination Agreement. Polar did not pay any cash to the Company for the Polar Retained Shares and retained all portions of the Prepayment Amount associated with the Polar Retained Shares. As a result of the ACM Termination Agreement and Polar Termination Agreement, the Company expects to record a charge to the consolidated statement of operations of approximately $20.3 million during the quarter ended March 31, 2024 to reverse the related subscription receivable and derivative liability on the accompanying consolidated balance sheet. Convertible Note Subscription and License Agreement Amendment On March 19, 2024, the Company entered into a subscription agreement with Daewoong (the “Subscription Agreement”) relating to the sale and issuance by the Company of senior secured convertible notes (each, a “Convertible Note” and together, the “Convertible Notes”) in the principal amount of up to $15.0 million, which are convertible into shares of the Company’s common stock, subject to certain conditions and limitations set forth in each Convertible Note. Each Convertible Note will contain customary events of default, will accrue interest at an annual rate of 15.79% and will have a maturity date that is three years from the funding date, unless earlier repurchased, converted or redeemed in accordance with its terms prior to such date. The Company will use the net proceeds from each Convertible Note to support the late-stage clinical development of its lead product candidate ABP-450 and for general working capital purposes. Pursuant to the terms of the Subscription Agreement, on March 24, 2024, the Company issued and sold to Daewoong one Convertible Note in the principal amount of $5.0 million. The Subscription Agreement further provides that the Company will issue and sell to Daewoong a second Convertible Note in the principal amount of $10.0 million no later than thirty (30) days following the Company’s compliance with certain conditions set forth in the Subscription Agreement, including the Company’s execution of an amendment to that certain License and Supply Agreement, by and between the Company and Daewoong, dated December 20, 2019, as amended on July 29, 2022, January 8, 2023 and April 24, 2023 (the “License Agreement”). On March 19, 2024, the Company entered into a Fourth Amendment to the License Agreement (the “License Agreement Amendment”) with Daewoong, which amends the License Agreement. Pursuant to the terms of the License Agreement Amendment, the License Agreement will terminate if, over any six month period, (a) the Company ceases to commercialize ABP-450 in certain territories specified in the License Agreement and (b) the Company ceases to advance any clinical studies of ABP-450 in such territories. The License Agreement Amendment also provides that, in the event that the License Agreement is terminated for the foregoing reasons, Daewoong will have the right to purchase all Know-How (as defined in the License Agreement) related to ABP-450 for a price of $1.00 (the “Termination Purchase Right”). The Termination Purchase Right will terminate and expire upon Daewoong’s sale of 50% of its common stock, including common stock held by its affiliates and common stock that would be issued upon an Automatic Conversion or Optional Conversion (as defined in the Convertible Notes).

Subsequent Events

12 Months Ended

Dec. 31, 2023

Note 12. Subsequent Events

The Company has further evaluated subsequent events for recognition and remeasurement purposes as of and for the twelve months ended December 31, 2023. After review and evaluation, management has concluded that there were no material subsequent events as of the date that the financial statements were available to be issued, except as discussed below.

Termination of Forward Purchase Agreements

On March 18, 2024, the Company and ACM ARRT J LLC (“ACM”) entered into a termination agreement (the “ACM Termination Agreement”) terminating that certain Forward Purchase Agreement, dated June 29, 2023, by and among the Company and ACM (the “ACM FPA”). The ACM Termination Agreement provides that (i) ACM will retain 3,100,000 previously issued shares of Common Stock held by ACM pursuant to the ACM FPA and its respective subscription agreement (the “ACM Retained Shares”) and (ii) the Company will be subject to up to $1,500,000 in liquidated damages if it fails to meet certain registration requirements for the ACM Retained Shares, subject to certain conditions set forth in the ACM Termination Agreement. ACM did not pay any cash to the Company for the ACM Retained Shares and retained all portions of the Prepayment Amount associated with the ACM Retained Shares.

On March 18, 2024, the Company and Polar entered into a termination agreement (the “Polar Termination Agreement”) terminating that certain Forward Purchase Agreement, dated June 29, 2023, by and among the Company and Polar (the “Polar FPA”). The Polar Termination Agreement provides that (i) Polar will retain 3,175,000 previously issued shares of Common Stock held by Polar pursuant to the Polar FPA and its respective subscription agreement (the “Polar Retained Shares”) and (ii) the Company will be subject to up to $1,500,000 in liquidated damages if it fails to meet certain registration requirements for the Polar Retained Shares,

subject to certain conditions set forth in the Polar Termination Agreement. Polar did not pay any cash to the Company for the Polar Retained Shares and retained all portions of the Prepayment Amount associated with the Polar Retained Shares.

As a result of the ACM Termination Agreement and Polar Termination Agreement, the Company expects to record a charge to the consolidated statement of operations of approximately $20.3 million during the quarter ended March 31, 2024 to reverse the related subscription receivable and derivative liability on the accompanying consolidated balance sheet.

Convertible Note Subscription and License Agreement Amendment

On March 19, 2024, the Company entered into a subscription agreement with Daewoong (the “Subscription Agreement”) relating to the sale and issuance by the Company of senior secured convertible notes (each, a “Convertible Note” and together, the “Convertible Notes”) in the principal amount of up to $15.0 million, which are convertible into shares of the Company’s common stock, subject to certain conditions and limitations set forth in each Convertible Note. Each Convertible Note will contain customary events of default, will accrue interest at an annual rate of 15.79% and will have a maturity date that is three years from the funding date, unless earlier repurchased, converted or redeemed in accordance with its terms prior to such date. The Company will use the net proceeds from each Convertible Note to support the late-stage clinical development of its lead product candidate ABP-450 and for general working capital purposes. Pursuant to the terms of the Subscription Agreement, on March 24, 2024, the Company issued and sold to Daewoong one Convertible Note in the principal amount of $5.0 million. The Subscription Agreement further provides that the Company will issue and sell to Daewoong a second Convertible Note in the principal amount of $10.0 million no later than thirty (30) days following the Company’s compliance with certain conditions set forth in the Subscription Agreement, including the Company’s execution of an amendment to that certain License and Supply Agreement, by and between the Company and Daewoong, dated December 20, 2019, as amended on July 29, 2022, January 8, 2023 and April 24, 2023 (the “License Agreement”).

On March 19, 2024, the Company entered into a Fourth Amendment to the License Agreement (the “License Agreement Amendment”) with Daewoong, which amends the License Agreement. Pursuant to the terms of the License Agreement Amendment, the License Agreement will terminate if, over any six month period, (a) the Company ceases to commercialize ABP-450 in certain territories specified in the License Agreement and (b) the Company ceases to advance any clinical studies of ABP-450 in such territories. The License Agreement Amendment also provides that, in the event that the License Agreement is terminated for the foregoing reasons, Daewoong will have the right to purchase all Know-How (as defined in the License Agreement) related to ABP-450 for a price of $1.00 (the “Termination Purchase Right”). The Termination Purchase Right will terminate and expire upon Daewoong’s sale of 50% of its common stock, including common stock held by its affiliates and common stock that would be issued upon an Automatic Conversion or Optional Conversion (as defined in the Convertible Notes).