Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2020	Feb. 28, 2020
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2020
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity Registrant Name	TRANSACT TECHNOLOGIES INC
Entity Incorporation, State or Country Code	DE
Entity File Number	000-21121
Entity Tax Identification Number	06-1456680
Entity Address, Address Line One	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
Entity Filer Category	Accelerated Filer
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Small Business	true
Entity Common Stock, Shares Outstanding		7,534,133
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q1
Entity Central Index Key	0001017303