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Debt - Additional Information (Details)					1 Months Ended			3 Months Ended			4 Months Ended	5 Months Ended	6 Months Ended	7 Months Ended		9 Months Ended	12 Months Ended
Debt - Additional Information (Details)	Apr. 16, 2024 USD ($)	Apr. 14, 2024 USD ($) $ / shares	Aug. 01, 2023 USD ($) $ / shares shares	May 02, 2023 USD ($)	Aug. 31, 2023	Jan. 31, 2022 USD ($)	Dec. 31, 2021 USD ($) shares	Sep. 30, 2024 USD ($)	Jun. 30, 2024 USD ($)	Mar. 31, 2024 USD ($)	Apr. 16, 2024 USD ($)	Dec. 31, 2023 USD ($) shares	Jun. 30, 2024 USD ($)	Aug. 31, 2023 USD ($)	Dec. 31, 2022 USD ($) shares	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($) shares	Dec. 31, 2023 USD ($) shares	Dec. 29, 2023 USD ($)	Sep. 30, 2022 USD ($)	Mar. 31, 2021 USD ($)
Debt Instrument [Line Items]
Warrants converted into warrants exercisable \| shares												16,151					767,697	16,151
Loss on extinguishment of debt									$ 8,713,000				$ 8,713,000			$ 8,713,000	$ 8,713,000	$ 3,929,000
Proceeds from issuance of convertible notes													48,000,000			48,000,000	48,000,000	28,700,000
Principal balance												$ 43,100,000					50,069,000	43,100,000
Repayment of convertible debt																		10,750,000
Other income (expense), net								$ 757,000	$ 999,000	$ 172,000			$ 1,171,000			$ 1,928,000	1,452,000	(643,000)
Backstop Agreement
Debt Instrument [Line Items]
Proceeds from issuance of convertible notes			$ 2,000,000
Shares issued upon conversion of outstanding notes \| shares			28,000
RTW Convertible Notes
Debt Instrument [Line Items]
Proceeds from issuance of convertible notes																	49,100,000
Principal balance																	50,069,000
Issuance costs																	1,400,000
Other income (expense), net																	1,100,000
Gain in fair value of revenue interest financing																	18,100,000
Change in fair value of revenue interest financing																	$ 4,700,000
Note Purchase Agreement \| Maximum
Debt Instrument [Line Items]
Unrestricted cash		$ 12,500,000
Note Purchase Agreement \| RTW Convertible Notes
Debt Instrument [Line Items]
Interest rate		6.00%
Debt instrument maturity date		Apr. 16, 2031
Principal amount		$ 48,000,000
Note Purchase Agreement \| RTW Convertible Notes \| Common Stock
Debt Instrument [Line Items]
Proceeds from issuance of convertible notes		$ 15,000,000
Initial conversion rate		24.692
Debt instrument, principal amount for conversion into common stock		$ 1,000
Initial conversion price per share \| $ / shares		$ 40.5
Premium percentage of stock price trigger		35.00%
Maximum percentage of number of shares of common stock outstanding		1.00%
Fortress Credit Agreement
Debt Instrument [Line Items]
Interest, frequency of payment																	The Fortress Term Loan has a maturity date of June 30, 2027 and accrues interest per annum at a rate of 6.44% plus the greater of (i) the Wall Street Journal Prime Rate and (ii) 3.0%, which interest is payable in arrears on a monthly basis. An exit payment equal to 3.0% of the Fortress Term Loan (the "Exit Fee") is due upon prepayment or the maturity date of the Fortress Term Loan, in addition to any early prepayment fee.
2021 Convertible Notes
Debt Instrument [Line Items]
Interest expense																		100,000
Proceeds from issuance of convertible notes							$ 2,000,000
Interest rate							5.00%
Debt instrument, term							36 months
Unamortized debt issuance costs							$ 0
Conversion divided by capped conversion price							600,000,000
2021 Convertible Notes \| Common Stock
Debt Instrument [Line Items]
Aggregate recognition APIC amount			$ 2,200,000
Shares issued upon conversion of outstanding notes \| shares			5,345
2022 Convertible Notes
Debt Instrument [Line Items]
Proceeds from issuance of convertible notes						$ 1,100,000
Interest rate						5.00%
Debt instrument, term						36 months
2022 Convertible Notes \| Common Stock
Debt Instrument [Line Items]
Aggregate recognition APIC amount			$ 1,200,000
Shares issued upon conversion of outstanding notes \| shares			3,329
2022 Convertible Notes \| Maximum
Debt Instrument [Line Items]
Interest expense																		100,000
2023 Convertible Notes
Debt Instrument [Line Items]
Repayment of principal			$ 500,000
Interest expense																		500,000
Proceeds from issuance of convertible notes														$ 28,700,000
Interest rate					7.00%									7.00%
Debt instrument maturity date														Dec. 31, 2026
Conversion divided by discounted capped conversion price														$ 217,300,000
Capped price														$ 260,000,000
Percentage of conversion discounted price is calculated of cash price														85.00%
Repayment of convertible debt			2,000,000
Debt prepayment penalty			$ 1,500,000
Initial conversion price per share \| $ / shares			$ 176
2023 Convertible Notes \| Common Stock
Debt Instrument [Line Items]
Aggregate recognition APIC amount			$ 22,200,000
Shares issued upon conversion of outstanding notes \| shares			123,376
HVL Bridge Note
Debt Instrument [Line Items]
Proceeds from issuance of convertible notes			$ 2,700,000
Principal balance			6,300,000
Aggregate recognition APIC amount			$ 2,700,000
Shares issued upon conversion of outstanding notes \| shares			15,508
Repayment of convertible debt			$ 6,300,000
Debt instrument, convertible price for calculating equity securities			$ 125
Deferred liability for issuance of additional shares				$ 3,400,000
HVL Bridge Note \| Common Stock
Debt Instrument [Line Items]
Shares issued upon conversion of outstanding notes \| shares			12,000
HVL Bridge Note \| Minimum
Debt Instrument [Line Items]
Repayment of convertible debt			$ 6,000,000
HVL Bridge Note \| Backstop Agreement
Debt Instrument [Line Items]
Proceeds from issuance of convertible notes			2,000,000
Deferred liability for issuance of additional shares				3,300,000
HVL Bridge Note \| Backstop Agreement \| Maximum
Debt Instrument [Line Items]
Proceeds from issuance of convertible notes				$ 2,000,000
2021 Term Loan
Debt Instrument [Line Items]
Interest expense																		5,000,000
Contractual interest																		4,700,000
Amortization of the debt discount																		100,000
Accretion																		100,000
Amortization of the warrant																		100,000
2021 Term Loan \| 2021 Term Loan Agreement \| Runway
Debt Instrument [Line Items]
Term loan borrowed																					$ 25,000,000
Total payoff amount			58,000,000
Repayment of principal			55,000,000
Loss on extinguishment of debt			3,900,000
Prepayment fee			1,100,000
Final payment fee			$ 1,600,000
Prepayment fee percentage			2.00%
Original final payment			$ 100,000
Final payment fee percentage			3.00%
2021 Term Loan \| Amended 2021 Term Loan Agreement \| Runway
Debt Instrument [Line Items]
Additional borrowings																				$ 30,000,000
Term C Loan \| Amended 2021 Term Loan Agreement \| Runway
Debt Instrument [Line Items]
Additional borrowings							$ 20,000,000
Maturity Date							Dec. 30, 2025
Fair value of the warrants												300,000					$ 300,000	300,000
Term C Loan \| Amended 2021 Term Loan Agreement \| Runway \| Legacy Allurion Series C Preferred Stock
Debt Instrument [Line Items]
Warrants exercisable \| shares							132,979
Term C Loan \| Amended 2021 Term Loan Agreement \| Runway \| Common Stock
Debt Instrument [Line Items]
Warrants converted into warrants exercisable \| shares			5,203
Term C Loan \| Amended 2021 Term Loan Agreement \| Runway \| Series D-1 Preferred Stock
Debt Instrument [Line Items]
Warrants exercisable \| shares															88,440
Term D Loan \| Amended 2021 Term Loan Agreement \| Runway
Debt Instrument [Line Items]
Fair value of the warrants												800,000			$ 800,000			800,000
Term D Loan \| Amended 2021 Term Loan Agreement \| Runway \| Common Stock
Debt Instrument [Line Items]
Warrants converted into warrants exercisable \| shares			3,620
Term D Loan \| Amended 2021 Term Loan Agreement \| Runway \| Series D-1 Preferred Stock
Debt Instrument [Line Items]
Warrants converted into warrants exercisable \| shares			88,440
Term D Loan \| Amended 2021 Term Loan Agreement \| Runway \| Maximum
Debt Instrument [Line Items]
Additional borrowings																				$ 15,000,000
Fortress Term Loan
Debt Instrument [Line Items]
Loss on extinguishment of debt																	(8,700,000)
Principal balance												43,100,000						$ 43,100,000
Issuance costs			$ 2,500,000
Fortress Term Loan \| Note Purchase Agreement
Debt Instrument [Line Items]
Total payoff amount	$ 48,000,000
Repayment of principal	43,100,000
Prepayment fee	2,700,000
Exit fee	1,300,000
Other fees	600,000
Accrued interest	$ 300,000										$ 300,000
Fortress Term Loan \| Fortress Credit Agreement
Debt Instrument [Line Items]
Initial cash proceeds			$ 60,000,000
Basis spread on variable rate			3.00%
Debt instrument exit payment percentage			3.00%
Interest expense												4,100,000					2,300,000
Contractual interest												3,800,000					1,900,000
Amortization of the debt discount												200,000					300,000
Accretion												$ 100,000					$ 100,000
Interest rate					6.44%						14.94%
Issuance costs			$ 2,500,000
Debt instrument maturity date																	Jun. 30, 2027
Minimum Liquidity Amount																			$ 12,500,000
Default interest rate			3.00%
Fair value of term loan derivative liability			$ 1,900,000														$ 0
Gain recorded on derivative																	$ 2,000,000
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]																	Other income (expense), net
Fortress Term Loan \| HVL Bridge Note \| Backstop Agreement \| Common Stock
Debt Instrument [Line Items]
Aggregate recognition APIC amount			$ 13,400,000
Shares issued upon conversion of outstanding notes \| shares			38,000
Fortress Term Loan \| Fortress Amendment
Debt Instrument [Line Items]
Unamortized debt issuance costs																			800,000
Principal amount																			20,000,000
Debt fee amount incurred																			3,100,000
Fortress Term Loan \| Fortress Amendment \| Until March 31, 2024
Debt Instrument [Line Items]
Minimum Liquidity Amount																			33,500,000
Fortress Term Loan \| Fortress Amendment \| From April 1, 2024 to June 30, 2024
Debt Instrument [Line Items]
Minimum Liquidity Amount																			23,500,000
Fortress Term Loan \| Fortress Amendment \| From July 1, 2024 to September 30, 2024
Debt Instrument [Line Items]
Minimum Liquidity Amount																			16,900,000
Fortress Term Loan \| Fortress Amendment \| On October 1, 2024 and Thereafter
Debt Instrument [Line Items]
Minimum Liquidity Amount																			12,500,000
Fortress Term Loan \| Fortress Amendment \| Maximum \| Common Stock
Debt Instrument [Line Items]
Principal balance																			$ 20,000,000