Cover Page - shares	3 Months Ended
	Mar. 31, 2020	Apr. 30, 2020
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2020
Document Transition Report	false
Entity File Number	001-37496
Entity Registrant Name	RAPID7, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	35-2423994
Entity Address, Address Line One	120 Causeway Street
Entity Address, City or Town	Boston,
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	02114
City Area Code	617
Local Phone Number	247-1717
Title of 12(b) Security	Common Stock, $0.01 par value per share
Trading Symbol	RPD
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		50,501,098
Entity Central Index Key	0001560327
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q1
Amendment Flag	false