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Fair Value Measurements - Preferred Stock Warrant Liability (Details) - USD ($)
$ / shares in Units, $ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Dec. 31, 2016
Fair Value Measurements      
Warrants to purchase shares of convertible preferred stock     342,011
Exercise price     $ 7.3097
Warrants liability at fair value $ 12,000 $ 1,447 $ 800