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Leases - Future Minimum Lease Payments for Operating Leases (Details) (Details) $ in Thousands | Dec. 31, 2019 USD ($)
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Operating Leases, After Adoption of 842: |
2020 | $ 1,239
2021 | 954
2022 | 582
2023 | 574
2025 | 75
Thereafter | 0
Total lease payments | 3,424
Less: interest | (343)
Total | $ 3,081

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- Definition Lease, Liability + References No definition available. + Details
Name: | par_LeaseLiability
Namespace Prefix: | par_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Lessee Lease Liability Undiscounted Excess Amount + References No definition available. + Details
Name: | par_LesseeLeaseLiabilityUndiscountedExcessAmount
Namespace Prefix: | par_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Lessee Liability Payments Due + References No definition available. + Details
Name: | par_LesseeLiabilityPaymentsDue
Namespace Prefix: | par_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Lessee Liability Payments Due After Year Five + References No definition available. + Details
Name: | par_LesseeLiabilityPaymentsDueAfterYearFive
Namespace Prefix: | par_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Lessee Liability Payments Due Next Twelve Months + References No definition available. + Details
Name: | par_LesseeLiabilityPaymentsDueNextTwelveMonths
Namespace Prefix: | par_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Lessee Liability Payments Due Year Five + References No definition available. + Details
Name: | par_LesseeLiabilityPaymentsDueYearFive
Namespace Prefix: | par_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Lessee Liability Payments Due Year Four + References No definition available. + Details
Name: | par_LesseeLiabilityPaymentsDueYearFour
Namespace Prefix: | par_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Lessee Liability Payments Due Year Three + References No definition available. + Details
Name: | par_LesseeLiabilityPaymentsDueYearThree
Namespace Prefix: | par_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Lessee Liability Payments Due Year Two + References No definition available. + Details
Name: | par_LesseeLiabilityPaymentsDueYearTwo
Namespace Prefix: | par_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration