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The Company and Liquidity
 3 Months Ended
Mar. 31, 2026
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
The Company and Liquidity

1. The Company and Liquidity

Alector, Inc. (Alector or the Company) is a Delaware corporation headquartered in South San Francisco, California. Alector is a biotechnology company focused on developing therapies to counteract the devastating progression of neurodegeneration.

At-the-Market Offering

On November 7, 2023, the Company entered into an at-the-market sales agreement with TD Securities (USA) LLC (TD Securities, formerly known as Cowen and Company, LLC) pursuant to which the Company may offer and sell from time to time through TD Securities up to $125,000,000 of shares of its common stock, in such share amounts as the Company may specify by notice to TD Securities (the Sales Agreement). As of March 31, 2026, the Company had issued an aggregate of 7,110,162 shares and received approximately $20.0 million in net proceeds from the sale of securities pursuant to the Sales Agreement, all of which were issued during the prior year. The Company did not issue any shares under the Sales Agreement during the three months ended March 31, 2026.