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Collaboration Agreements	12 Months Ended
Collaboration Agreements	Dec. 31, 2023
Related Party Transactions [Abstract]
Collaboration Agreements	Collaboration Agreements The Company recognizes revenue for collaboration agreements using a cost-based input measure. In applying the cost-based input method of revenue recognition, the Company uses actual costs incurred relative to budgeted costs expected to be incurred, and any upfront payments are deferred accordingly. In 2022 the Company entered into a collaboration agreement with ImmunoGen. Pursuant to the collaboration agreement, ImmunoGen will reimburse the Company for $2.0 million of the costs we incur in the Phase 1B combination cohort evaluating SL-172154 in combination with mirvetuximab soravtansine in patients with platinum-resistant ovarian cancer. The Company dosed its first patient with mirvetuximab soravtansine in 2023 and recognized $1.7 million of revenue under the collaboration agreement in 2023. In February 2024, ImmunoGen was acquired by AbbVie, Inc. In 2022, the Company also executed and completed a collaboration agreement with a third party and recognized $0.7 million in revenue. On February 13, 2024, we entered into a collaboration and license agreement (the “Ono Agreement”) with Ono Pharmaceutical Co., Ltd (“Ono”) pursuant to which the parties will collaborate in the research and preclinical development of certain prespecified compounds directed toward a pair of targets selected by Ono from our pipeline of bifunctional fusion proteins. Pursuant to the Ono Agreement, the Company granted to Ono an exclusive option (the “Option”) to enter into an exclusive license to further develop, manufacture and sell products containing these bifunctional fusion proteins. Pursuant to the Ono Agreement, the Company and Ono developed a nonclinical research plan (the “Research Plan”). The Company is primarily responsible for carrying out the research activities in accordance with the Research Plan, subject to the oversight of a joint research committee consisting of representatives from each party. Ono is responsible for all research costs incurred under the Research Plan. Pursuant to the Ono Agreement, Ono will pay the Company $5.4 million to secure the Option and to cover the first six months of expected research costs under the Research Plan. In addition to further Research Plan funding, the Company is entitled to receive from Ono up to $224.5 million in aggregate consisting of license fees and milestone payments based on the achievement of specified development, regulatory, and sales milestones. The company may receive tiered royalties on product sales, ranging from mid-single digit to low-double digit percentages. Ono may terminate the Collaboration Agreement at any time upon 90 days’ written notice to us. If Ono exercises such termination right, Ono will pay all of our costs up through the date of termination.