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Business Combination - Number of Shares of Allurion Common Stock Outstanding (Details) - shares	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Aug. 01, 2023
Business Acquisition [Line Items]
Total shares of Common Stock immediately after Business Combination	2,710,607	2,574,783	1,918,927	1,915,956	1,907,529	1,892,058
Legacy Allurion Equityholders
Business Acquisition [Line Items]
Total shares of Common Stock immediately after Business Combination						1,115,896
CPUH Stockholders
Business Acquisition [Line Items]
Total shares of Common Stock immediately after Business Combination						206,628
Shares Issued to PIPE Investors
Business Acquisition [Line Items]
Total shares of Common Stock immediately after Business Combination						215,468
Shares issued to RTW and Fortress
Business Acquisition [Line Items]
Total shares of Common Stock immediately after Business Combination						76,000
Shares Issued to Convertible Note Holders
Business Acquisition [Line Items]
Total shares of Common Stock immediately after Business Combination						132,049
CPUH Sponsor Shares
Business Acquisition [Line Items]
Total shares of Common Stock immediately after Business Combination						130,509
Side Letter Termination Shares
Business Acquisition [Line Items]
Total shares of Common Stock immediately after Business Combination						15,508

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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