| Document and Entity Information | Sep. 30, 2020 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Sep. 30, 2020 |
| Entity Registrant Name | PAR Technology Corporation |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-09720 |
| 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0000708821 |
| Title of 12(b) Security | Common stock |
| Trading Symbol | PAR |
| Security Exchange Name | NYSE |
