Basis of Presentation (Policies)	3 Months Ended
Basis of Presentation (Policies)	Mar. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	NOTE 1: BASIS OF PRESENTATION The accompanying unaudited interim condensed consolidated financial statements (“financial statements”) of PAR Technology Corporation and its consolidated subsidiaries (collectively, the “Company”, “PAR”, “we”, “us” or “our Company”) have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial statements and the instructions to Form 10-Q and Regulation S-X pertaining to interim financial statements as promulgated by the SEC. In the opinion of management, the Company's financial statements include all normal and recurring adjustments necessary in order to make the financial statements not misleading and to provide a fair presentation of the Company's financial results for the interim period included in this Quarterly Report. Interim results are not necessarily indicative of results for the full year or any future periods. The information included in this Quarterly Report should be read in conjunction with the Company's audited consolidated financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2021 (the “2021 Annual Report”). The preparation of the financial statements requires management of the Company to make a number of estimates and assumptions relating to the reported amount of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the period. Significant items subject to such estimates and assumptions include revenue recognition, stock-based compensation, the recognition and measurement of assets acquired and liabilities assumed in business combinations at fair value, the carrying amount of property, plant and equipment including right-to-use assets and liabilities, identifiable intangible assets and goodwill, the measurement of liabilities and equity recognized for outstanding convertible notes, current expected credit losses for receivables, net realizable value for inventories, and measurement of contingent consideration at fair value. Actual results could differ from these estimates. The Company's estimates and assumption are subject to uncertainties, including those associated with market conditions, risks and trends and the ongoing COVID-19 pandemic.
Segment Reporting	The Company operates in two distinct reporting segments, Restaurant/Retail and Government. The Company’s chief operating decision maker is the Company’s Chief Executive Officer. The Restaurant/Retail segment provides enterprise restaurants, franchisees, and other restaurant outlets in the three major restaurant categories, quick service, fast casual, and table service, with operational efficiencies, offering them an integrated cloud solution by combining Brink POS cloud software for front-of-house, Data Central back-office cloud solution, PAR Pay and PAR Payment Services for payments, and Punchh loyalty and engagement solution on a unified commerce cloud platform. The Government segment provides technical expertise and development of advanced systems and software solutions for the U.S. Department of Defense (“DoD”) and other federal agencies, as well as satellite command and control, communication, and IT mission systems at several DoD facilities worldwide. The financial statements also include corporate operations, which are comprised of enterprise-wide functional departments.
Cash and Cash Equivalents	Cash and Cash Equivalents The Company considers all highly liquid investments purchased with a remaining maturity of three months or less, to be cash equivalents, including money market funds. The Company maintained bank balances that, at times, exceeded the federally insured limit during the three months ended March 31, 2022. The Company has not experienced losses relating to these deposits and management does not believe that the Company is exposed to any significant credit risk with respect to these amounts.
Other Long-Term Liabilities	Other Long-Term Liabilities Other liabilities represent amounts owed to employees that participate in the Company’s deferred compensation plan and the long-term portion of the Coronavirus Aid, Relief, and Economic Security Act (the “CARES Act”) deferred payroll taxes. Amounts owed to employees participating in the deferred compensation plan was $2.1 million and $2.4 million at March 31, 2022 and December 31, 2021, respectively. Under the CARES Act employers can defer payment of the employer portion of social security taxes through the end of 2020: 50% of the deferred amount was due December 31, 2021 and the remaining 50% is due December 31, 2022. As allowed under the CARES Act, the Company deferred payment of the employer portion of social security taxes through the end of 2020.
Related Party Transactions	Related Party Transactions Act III Management LLC (“Act III Management”), a service company to the restaurant, hospitality, and entertainment industries, provides software development and restaurant technology consulting services to the Company pursuant to a master development agreement. Keith Pascal, a director of the Company, is an employee of Act III Management and serves as its vice president and secretary. Mr. Pascal does not have an ownership interest in Act III Management.
Recently Adopted Accounting Pronouncements	Recently Adopted Accounting Pronouncements In August 2020, the FASB issued ASU No. 2020-06, Debt – Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging – Contracts in Entity’s Own Equity (Subtopic 815-40). The new guidance is intended to simplify the accounting for certain convertible instruments with characteristics of both liability and equity. The guidance removes certain accounting models which separate the embedded conversion features from the host contract for convertible instruments. As a result, after the adoption of this guidance, an entity’s convertible debt instrument will be wholly accounted for as debt. The guidance also expands disclosure requirements for convertible instruments and simplifies areas of the guidance for diluted earnings-per-share calculations by requiring the use of the if-converted method. The guidance is effective for fiscal years beginning after December 15, 2021 and can be adopted on either a fully retrospective or modified retrospective basis. The Company adopted the new standard as of January 1, 2022 under the modified retrospective method and recorded a cumulative effect upon adoption of a $81.3 million increase to convertible notes, $66.6 million reduction to other paid in capital, $13.4 million reduction to accumulated deficit, and a $1.3 million reduction to deferred tax liability to reflect the reversal of the separation of the convertible debt between debt and equity. Prior year presentation of debt was not impacted. The adoption of this standard also decreased the amount of non-cash interest expense to be recognized in future periods as a result of eliminating the discount associated with the equity component. There was no impact to the Company’s condensed consolidated statements of cash flows as the result of the adoption of ASU No. 2020-06. In October 2021, the FASB issued ASU No. 2021-08, Business Combinations (Topic 805), Accounting for Contract Assets and Contract Liabilities from Contracts with Customers, which is intended to require acquiring entities to apply Topic 606 to recognize and measure contract assets and contract liabilities in a business combination. ASU 2021-08 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2022, with early adoption permitted. The Company early adopted the new standard as of January 1, 2022, with no impact to the Company's condensed consolidated financial statements at adoption. Future impact of adoption is dependent on Company's activity as an acquiring entity in transactions subject to Topic 805. With the exception of the standards discussed above, there were no other recent accounting pronouncements or changes in accounting pronouncements during the three months ended March 31, 2022 that are of significance or potential significance to the Company.