Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2020	Oct. 31, 2020
Cover [Abstract]
Entity Registrant Name	TRANSACT TECHNOLOGIES INC
Entity Central Index Key	0001017303
Current Fiscal Year End Date	--12-31
Document Type	10-Q
Amendment Flag	false
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q3
Document Transition Report	false
Entity File Number	0-21121
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	06-1456680
Entity Address, Address Line One	One Hamden Center
Entity Address, Address Line Two	2319 Whitney Avenue, Suite 3B
Entity Address, City or Town	Hamden
Entity Address, State or Province	CT
Entity Address, Postal Zip Code	06518
City Area Code	203
Local Phone Number	859-6800
Title of 12(b) Security	Common stock, par value $0.01 per share
Trading Symbol	TACT
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		8,928,885