Debt Instrument, Convertible, Measurement Period

No definition available.

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- Definition

Debt Instrument, Convertible, Measurement Period Percentage

+ References

No definition available.

+ Details

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Namespace Prefix:	par_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Instrument, Convertible, Threshold Percentage

+ References

No definition available.

+ Details

Name:	par_DebtInstrumentConvertibleThresholdPercentage
Namespace Prefix:	par_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Instrument, Debt Default, Description Of Violation Or Event Of Default, Amount

+ References

No definition available.

+ Details

Name:	par_DebtInstrumentDebtDefaultDescriptionOfViolationOrEventOfDefaultAmount
Namespace Prefix:	par_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Debt Instrument, Debt Default, Description Of Violation Or Event Of Default, Final Judgment Payment Period

+ References

No definition available.

+ Details

Name:	par_DebtInstrumentDebtDefaultDescriptionOfViolationOrEventOfDefaultFinalJudgmentPaymentPeriod
Namespace Prefix:	par_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Instrument, Debt Default, Description Of Violation Or Event Of Default, Percentage Of Amount Due

+ References

No definition available.

+ Details

Name:	par_DebtInstrumentDebtDefaultDescriptionOfViolationOrEventOfDefaultPercentageOfAmountDue
Namespace Prefix:	par_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Instrument, Deft Default, Description Of Violation Or Event Of Default, Default On Payment Of Interest Period

+ References

No definition available.

+ Details

Name:	par_DebtInstrumentDeftDefaultDescriptionOfViolationOrEventOfDefaultDefaultOnPaymentOfInterestPeriod
Namespace Prefix:	par_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instrument must exceed threshold percentage for specified number of trading days to trigger conversion feature.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Threshold number of specified trading days that common stock price to conversion price of convertible debt instruments must exceed threshold percentage within a specified consecutive trading period to trigger conversion feature.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentConvertibleThresholdTradingDays
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The cash inflow associated with the sale of a borrowing supported by a written promise to pay an obligation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585

+ Details

Name:	us-gaap_ProceedsFromSaleOfNotesReceivable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585

+ Details

Name:	us-gaap_RepaymentsOfLongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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Period Type:	duration

- Details

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- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=par_CitizensBankN.A.Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=par_ConvertibleSeniorNotesDue2024Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_ConvertibleDebtMember
Namespace Prefix:
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Period Type:

Subsequent Events (Details) $ in Thousands		3 Months Ended
Subsequent Events (Details) $ in Thousands	Apr. 15, 2019 USD ($) trading_day	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	Apr. 14, 2019 USD ($)	Apr. 10, 2019 USD ($)
Subsequent Event [Line Items]
Repayment of amounts outstanding under Credit Agreement		$ 0	$ 48
Subsequent Event
Subsequent Event [Line Items]
Net proceeds from sale of notes	$ 75,200
Convertible debt, threshold, trading days \| trading_day	20
Convertible debt, threshold, consecutive trading days \| trading_day	30
Convertible debt, threshold percentage	130.00%
Convertible debt, measurement period	5 days
Convertible debt, measurement period percentage	98.00%
Description of event of default, default on payment of interest period	30 days
Description of event of default, aggregate principal amount of final judgments	$ 10,000
Description of event of default, final judgment payment period	60 days
Percentage of principal amount due if event of default occurs (at least)	25.00%
Subsequent Event \| Revolving Loans \| Citizens Bank, N.A.
Subsequent Event [Line Items]
Repayment of amounts outstanding under Credit Agreement	$ 16,100
Revolving loans, aggregate principal amount				$ 25,000
Subsequent Event \| Convertible Senior Notes due 2024 \| Convertible Notes
Subsequent Event [Line Items]
Issuance and sale of notes					$ 80,000
Stated interest rate					4.50%