Document and Entity Information	9 Months Ended
	Sep. 30, 2019 shares
Cover [Abstract]
Entity Registrant Name	TRANSACT TECHNOLOGIES INC
Entity Central Index Key	0001017303
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Shell Company	false
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding	0
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3
Entity Address, State or Province	CT