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Segment and Related Information - Schedule of identifiable assets by geographic area (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Identifiable assets | $ 114,624 | $ 124,049
United States | Reportable Geographical Components |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Identifiable assets | 99,284 | 110,369
Other Countries | Reportable Geographical Components |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Identifiable assets | $ 15,340 | $ 13,680

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized, excluding assets of discontinued operations. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References No definition available. + Details
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Namespace Prefix: | par_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_StatementGeographicalAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_ConsolidationItemsAxis=us-gaap_ReportableGeographicalComponentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementGeographicalAxis=par_OtherCountriesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |