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Description of Business	9 Months Ended
Description of Business	Sep. 30, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business	Description of Business BillionToOne, Inc. (the “Company”, “we”, or “our”) was formed in 2016, and is headquartered in Menlo Park, California. The Company is a precision diagnostics company that quantifies biology to create molecular diagnostics. The Company’s proprietary molecular counting platform is designed to detect and measure DNA molecules at the single-count level to help improve disease detection. The Company currently applies the proprietary technology to non-invasive prenatal screening (“Prenatal”) and liquid biopsy (“Oncology”).