Cover - shares	9 Months Ended
	Sep. 30, 2021	Nov. 02, 2021
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2021
Document Transition Report	false
Entity File Number	1-09720
Entity Registrant Name	PAR TECHNOLOGY CORPORATION
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	16-1434688
Entity Address, Address Line One	PAR Technology Park
Entity Address, Address Line Two	8383 Seneca Turnpike
Entity Address, City or Town	New Hartford
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	13413-4991
City Area Code	315
Local Phone Number	738-0600
Title of 12(b) Security	Common Stock, $0.02 par value
Trading Symbol	PAR
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		26,864,741
Entity Central Index Key	0000708821
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
Amendment Flag	false