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Stockholders' Equity and Share-Based Compensation - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
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3 Months Ended |
0 Months Ended |
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Apr. 04, 2015
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Mar. 29, 2014
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Mar. 31, 2015
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Nov. 19, 2014
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Jan. 03, 2015
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Shares of common stock authorized |
100,000,000us-gaap_CommonStockSharesAuthorized
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100,000,000us-gaap_CommonStockSharesAuthorized
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| Dividend payment date |
$ 0us-gaap_DividendsCommonStock
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| Amounts capitalized to internally-developed software |
39us-gaap_CapitalizedComputerSoftwareAdditions
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39us-gaap_CapitalizedComputerSoftwareAdditions
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| Common stock amount |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Shares of common stock authorized |
100,000,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
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| Common stock issued from vested restricted stock units |
247,000us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
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| Common stock amount | Series A Preferred Stock |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Issuance of shares related to dividends on preferred stock |
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27,000us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
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| Dividend payment date |
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59us-gaap_DividendsCommonStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
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| Stock Option |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Common stock options exercised |
142,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
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| Weighted-average fair value of options granted (in dollars per share) |
$ 1.18us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
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$ 1.19us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
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| Intrinsic value |
211us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
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14us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
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| Unrecognized share-based compensation expense |
1,773us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
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| Weighted-average period of unrecognized share-based compensation expense |
2 years 10 months 27 days
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| Shares withheld to satisfy employee tax obligations |
27,000us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
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| Adjustment related employee tax obligations |
80us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
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| Net settlement of stock options (in shares) |
64,000prts_SharesWithheldtoNetSettleStockOptions
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
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| Stock Option | Common stock amount |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Common stock options exercised |
51,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
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| Restricted Stock Units |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Weighted-average period of unrecognized share-based compensation expense |
10 months 2 days
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| Shares withheld to satisfy employee tax obligations |
151,000us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
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| Adjustment related employee tax obligations |
358us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
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| Forfeiture rate for stock awards |
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0.00%prts_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsForfeitureRate
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
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| Restricted Stock Units | Common stock amount |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Adjustment related employee tax obligations |
1us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
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| AMD Plan | Stock Option |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Common stock options exercised |
0us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= prts_EquityIncentivePlan2014Member
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| Weighted-average fair value of options granted (in dollars per share) |
$ 0.54us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= prts_EquityIncentivePlan2014Member
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$ 0.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= prts_EquityIncentivePlan2014Member
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| Intrinsic value |
0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= prts_EquityIncentivePlan2014Member
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0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= prts_EquityIncentivePlan2014Member
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| Unrecognized share-based compensation expense |
$ 450us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= prts_EquityIncentivePlan2014Member
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| Weighted-average period of unrecognized share-based compensation expense |
3 years 9 months 18 days
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| Shares of common stock authorized |
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1,950,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= prts_EquityIncentivePlan2014Member
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| Expiration period (no later than) |
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10 years
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| Stock option, vesting period |
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4 years
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| Exercise price of option grants, percentage |
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100.00%prts_ExercisePriceOfOptionGrants
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= prts_EquityIncentivePlan2014Member
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| Shares available for grant |
780,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= prts_EquityIncentivePlan2014Member
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| Minimum |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock option, vesting period |
3 years
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| Minimum | Stock Option |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Forfeiture rate for stock options |
16.00%prts_SharebasedCompensationArrangementbySharebasedPaymentAwardOptionsForfeitureRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
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16.00%prts_SharebasedCompensationArrangementbySharebasedPaymentAwardOptionsForfeitureRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
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| Minimum | Restricted Stock Units |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Forfeiture rate for stock awards |
10.00%prts_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsForfeitureRate
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
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| Maximum |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock option, vesting period |
4 years
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| Maximum | Stock Option |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Forfeiture rate for stock options |
34.00%prts_SharebasedCompensationArrangementbySharebasedPaymentAwardOptionsForfeitureRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
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34.00%prts_SharebasedCompensationArrangementbySharebasedPaymentAwardOptionsForfeitureRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
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| Maximum | Restricted Stock Units |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Forfeiture rate for stock awards |
20.00%prts_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsForfeitureRate
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
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