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Income Taxes - Reconciliation of Differences Between Federal Statutory and Effective Income Tax Rate (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 28, 2014	Dec. 29, 2013	Dec. 30, 2012
Income Tax Disclosure [Abstract]
Computed "expected" tax expense	$ 2,411us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 380us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 2,726us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Permanent differences	97pbpb_IncomeTaxReconciliationPermanentDifference	63pbpb_IncomeTaxReconciliationPermanentDifference
State and local income taxes, net of federal income tax effect	460us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	145us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	358us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
FICA and other tax credits	(222)us-gaap_IncomeTaxReconciliationTaxCredits	(113)us-gaap_IncomeTaxReconciliationTaxCredits	(41)us-gaap_IncomeTaxReconciliationTaxCredits
Change in valuation allowance			(19,078)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Non-deductible IPO costs		195us-gaap_IncomeTaxReconciliationNondeductibleExpense
Rate change and true-ups	2us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate	(874)us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate	41us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate
Income tax expense (benefit)	$ 2,748us-gaap_IncomeTaxExpenseBenefit	$ (204)us-gaap_IncomeTaxExpenseBenefit	$ (15,994)us-gaap_IncomeTaxExpenseBenefit

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Income Tax Reconciliation Permanent Differences.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to state and local income tax expense (benefit).

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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