Cover Page - USD ($)	12 Months Ended
Cover Page - USD ($)	Dec. 31, 2025	Mar. 06, 2026	Jun. 30, 2025
Document Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2025
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	001-40592
Entity Registrant Name	Rapid Micro Biosystems, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	20-8121647
Entity Address, Address Line One	25 Hartwell Avenue
Entity Address, City or Town	Lexington
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	02421
City Area Code	978
Local Phone Number	349-3200
Title of 12(b) Security	Class A common stock, $0.01 par valueper share
Trading Symbol	RPID
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
ICFR Auditor Attestation Flag	false
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Public Float			$ 103,561,445
Documents Incorporated by Reference	Portions of the registrant’s definitive Proxy Statement relating to its 2026 Annual Meeting of Stockholders to be filed with the SEC within 120 days after the end of the fiscal year ended December 31, 2025 are incorporated herein by reference in Part III.
Entity Central Index Key	0001380106
Document Fiscal Year Focus	2025
Document Fiscal Period Focus	FY
Amendment Flag	false
Class A Common stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding (in shares)		40,963,464
Class B Common stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding (in shares)		4,499,529