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Stock Based Compensation (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense $ 1,185,000us-gaap_ShareBasedCompensation $ 187,000us-gaap_ShareBasedCompensation
Stock-based compensation expense, tax benefit 114,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense 436,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
No. of Shares [Roll Forward]    
Outstanding (in shares) 1,048,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber  
Options granted (in shares) 417,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross  
Forfeited and cancelled (in shares) (225,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod  
Outstanding (in shares) 1,340,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 1,048,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Vested and expected to vest (in shares) 1,192,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber  
Total shares exercisable (in shares) 344,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber  
Shares remaining available for grant (in shares) 332,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant  
Weighted Average Exercise Price [Roll Forward]    
Outstanding (in dollars per share) $ 5.45us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice  
Options granted (in dollars per share) $ 5.15us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice  
Forfeited and cancelled (in dollars per share) $ 5.16us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice  
Outstanding (in dollars per share) $ 5.28us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice $ 5.45us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Vested and expected to vest (in dollars per share) $ 5.28us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice  
Total shares exercisable (in dollars per share) $ 5.60us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice  
Aggregate Intrinsic Value [Abstract]    
Outstanding 270,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue  
Outstanding 1,264,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue 270,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
Vested and expected to vest 1,215,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue  
Total shares exercisable 344,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1  
Weighted average grant date fair value of options granted (in dollars per share) $ 1.68us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 1.55us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Total intrinsic value of options exercised 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue 11,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
Assumptions used for fair value of options at the date of the grant [Abstract]    
Expected option life 5 years 10 months 24 days 4 years 7 months 6 days
Weighted average risk-free interest rate (in hundredths) 1.70%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate 1.30%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate
Weighted average expected volatility (in hundredths) 31.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate 33.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
Expected dividend yield (in hundredths) 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
Unrecognized compensation expense 1,700,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized  
Period for recognition 2015 through 2018  
Weighted average grant date fair value [Roll Forward]    
Restricted stock awards granted (in shares) 170,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod 247,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Share price (in dollars per share) $ 0.02us-gaap_SharePrice  
Days prior to grant date considered for fair value of award 0 days  
Weighted average grant date fair value (in dollars per share) $ 5.24us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 4.50us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Shares released (in shares) 112,000us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross 49,000us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
Restricted stock awards cancelled (in shares) 62,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod 95,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
$4.06 - $6.25 [Member]    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Lower Range of Exercise Price (in dollars per share) $ 4.06us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= par_ExercisePriceRangeOneMember		  
Upper Range of Exercise Price (in dollars per share) $ 6.25us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= par_ExercisePriceRangeOneMember		  
Number Outstanding (in shares) 1,203,000us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= par_ExercisePriceRangeOneMember		  
Weighted Average Remaining Life 8 years 7 months 13 days  
Weighted Average Exercise Price (in dollars per share) $ 5.07us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= par_ExercisePriceRangeOneMember		  
$6.26- $11.40 [Member]    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Lower Range of Exercise Price (in dollars per share) $ 6.26us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= par_ExercisePriceRangeTwoMember		  
Upper Range of Exercise Price (in dollars per share) $ 11.40us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= par_ExercisePriceRangeTwoMember		  
Number Outstanding (in shares) 37,000us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= par_ExercisePriceRangeTwoMember		  
Weighted Average Remaining Life 1 year 4 months 13 days  
Weighted Average Exercise Price (in dollars per share) $ 10.04us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= par_ExercisePriceRangeTwoMember		  
$4.06 - $11.40 [Member]    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Lower Range of Exercise Price (in dollars per share) $ 4.06us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= par_ExercisePriceRangeFourMember		  
Upper Range of Exercise Price (in dollars per share) $ 11.40us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= par_ExercisePriceRangeFourMember		  
Number Outstanding (in shares) 1,240,000us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= par_ExercisePriceRangeFourMember		  
Weighted Average Remaining Life 8 years 4 months 28 days  
Weighted Average Exercise Price (in dollars per share) $ 5.28us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= par_ExercisePriceRangeFourMember		  
Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense $ 895,000us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 $ 438,000us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Restricted Stock [Member] | Minimum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period 0 months  
Restricted Stock [Member] | Maximum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period 60 months  
Performance Based Restricted Stock [Member]    
Weighted average grant date fair value [Roll Forward]    
Restricted stock awards granted (in shares)   109,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
Restricted stock awards cancelled (in shares) 52,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		 93,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
Performance Based Restricted Stock [Member] | Minimum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period 12 months  
Performance Based Restricted Stock [Member] | Maximum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period 36 months  
Non-vested Equity Awards [Member]    
Activity of nonvested options outstanding [Roll Forward]    
Balance (in shares) 277,000par_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonvestedOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= par_NonVestedEquityAwardsMember		  
Granted (in shares) 170,000par_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonvestedOptionsGrantsInPeriodGross
/ us-gaap_PlanNameAxis
= par_NonVestedEquityAwardsMember		  
Vested (in shares) (112,000)par_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonvestedOptionsVestedInPeriod
/ us-gaap_PlanNameAxis
= par_NonVestedEquityAwardsMember		  
Forfeited and cancelled (in shares) (62,000)par_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonvestedOptionsForfeituresInPeriod
/ us-gaap_PlanNameAxis
= par_NonVestedEquityAwardsMember		  
Balance (in shares) 273,000par_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonvestedOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= par_NonVestedEquityAwardsMember		 277,000par_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonvestedOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= par_NonVestedEquityAwardsMember
Weighted average grant date fair value [Roll Forward]    
Balance (in dollars per share) $ 4.68par_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonvestedOptionsWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= par_NonVestedEquityAwardsMember		 $ 4.65par_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonvestedOptionsWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= par_NonVestedEquityAwardsMember
Granted (in dollars per share) $ 5.24par_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonvestedOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= par_NonVestedEquityAwardsMember		  
Vested (in dollars per share) $ 4.32par_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonvestedOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= par_NonVestedEquityAwardsMember		  
Forfeited and cancelled (in dollars per share) $ 3.46par_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonvestedOptionsForfeitedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= par_NonVestedEquityAwardsMember		  
Balance (in dollars per share) $ 4.68par_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonvestedOptionsWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= par_NonVestedEquityAwardsMember		 $ 4.65par_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonvestedOptionsWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= par_NonVestedEquityAwardsMember
2005 Equity Incentive Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares reserved under plan (in shares) 2,250,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= par_EquityIncentivePlan2005Member		  
Expiration period 10 years  
2005 Equity Incentive Plan [Member] | Minimum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period 1 year  
2005 Equity Incentive Plan [Member] | Maximum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period 5 years