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Revenue Recognition - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disaggregation of Revenue [Line Items] |  |
Performance obligation, contract term | 12 |
Customer deposits | $ 1.5 | $ 3.5
Minimum |  |
Disaggregation of Revenue [Line Items] |  |
Payment period | 30 days |
Maximum |  |
Disaggregation of Revenue [Line Items] |  |
Payment period | 90 days |

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- Definition Customer Deposits + References No definition available. + Details
Name: | par_CustomerDeposits
Namespace Prefix: | par_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Revenue From Contract With Customer, Payment Period + References No definition available. + Details
Name: | par_RevenueFromContractWithCustomerPaymentPeriod
Namespace Prefix: | par_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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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
Name: | us-gaap_DisaggregationOfRevenueLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Description of timing for satisfying performance obligation in contract with customer. Includes, but is not limited to, as services are rendered, and upon shipment, delivery or completion of service. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 + Details
Name: | us-gaap_RevenuePerformanceObligationDescriptionOfTiming
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |