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Stockholders' Equity and Share-Based Compensation - Share-Based Compensation Plan Information (Details) (USD $)
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12 Months Ended | ||
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Jan. 03, 2015
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Dec. 28, 2013
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Dec. 29, 2012
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Weighted-average fair value of options granted | $ 1.34us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue | $ 1.22us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue | $ 2.53us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue |
| Intrinsic value of the exercised options | $ 153,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue | $ 61,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue | $ 1,244,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue |
| Unrecognized share-based compensation expense | $ 1,601,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions | ||
| Weighted-average period of unrecognized compensation expense | 2 years 7 months 28 days | ||
| 2006 Equity Incentive Plan | |||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Shares available for future grants |
0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = prts_TwoZeroZeroSixEquityIncentivePlanMember |
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| 2007 Omnibus Plan | |||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Common stock authorized |
2,400,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = prts_TwoZeroZeroSevenOmnibusPlanMember |
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| Maximum number of shares authorized to issued under condition one |
1,500,000prts_MaximumNumberOfSharesAuthorizedToIssuedUnderConditionOne / us-gaap_PlanNameAxis = prts_TwoZeroZeroSevenOmnibusPlanMember |
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| Maximum percentage of shares authorized to issued under condition one |
5.00%prts_MaximumPercentageOfSharesAuthorizedToIssuedUnderConditionOne / us-gaap_PlanNameAxis = prts_TwoZeroZeroSevenOmnibusPlanMember |
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| Expiration period | 10 years | ||
| Option grant vesting period | 4 years | ||
| Exercise price of option grants |
100.00%prts_ExercisePriceOfOptionGrants / us-gaap_PlanNameAxis = prts_TwoZeroZeroSevenOmnibusPlanMember |
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| Shares available for future grants |
1,515,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = prts_TwoZeroZeroSevenOmnibusPlanMember |
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| 2007 New Employee Incentive Plan | |||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Common stock authorized |
2,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = prts_TwoZeroZeroSevenNewEmployeeIncentivePlanMember |
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| Expiration period | 10 years | ||
| Option grant vesting period | 4 years | ||
| Exercise price of option grants |
100.00%prts_ExercisePriceOfOptionGrants / us-gaap_PlanNameAxis = prts_TwoZeroZeroSevenNewEmployeeIncentivePlanMember |
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| Shares available for future grants |
1,552,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = prts_TwoZeroZeroSevenNewEmployeeIncentivePlanMember |
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- Definition
Exercise price of options grants as a percentage of the fair market value/stock price at the date of grant. No definition available.
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- Definition
Maximum number of shares authorized to issued under condition one. No definition available.
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- Definition
Maximum Percentage of shares authorized to issued under condition one. No definition available.
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- Definition
Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Unrecognized cost of unvested options awarded to employees as compensation. No definition available.
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| X | ||||||||||
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- Definition
Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition
The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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