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Nature of Business	6 Months Ended
	Jun. 30, 2026
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Business	1. Nature of Business Syndax Pharmaceuticals, Inc. is a commercial-stage biopharmaceutical company advancing innovative cancer therapies. We currently have two commercially approved products and a robust pipeline of late- and early-stage development programs. We were incorporated in Delaware in 2005. We have operations in New York, NY, and we operate in one segment. References in these notes to unaudited consolidated financial statements to “Syndax,” “the Company,” “we,” “us” or “our” refer to Syndax Pharmaceuticals, Inc. and its wholly owned subsidiaries.

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- Definition

The entire disclosure for the nature of an entity's business, major products or services, principal markets including location, and the relative importance of its operations in each business and the basis for the determination, including but not limited to, assets, revenues, or earnings. For an entity that has not commenced principal operations, disclosures about the risks and uncertainties related to the activities in which the entity is currently engaged and an understanding of what those activities are being directed toward.

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Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 275
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 4
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-Topic 275
-SubTopic 10
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-Topic 275
-SubTopic 10
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-Section 50
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