Income Taxes - Deferred Tax Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 27, 2014	Dec. 28, 2013
Deferred tax assets:
Reserves and accruals	$ 10,744	$ 10,592
Deferred revenue	1,370	1,614
Shared based compensation	4,030	3,789
Tax credit carry-forwards	8,122	6,591
Net operating losses	14,695	10,220
Depreciation & amortization	2,750	3,241
Other	372us-gaap_DeferredTaxAssetsOther	966us-gaap_DeferredTaxAssetsOther
Total deferred tax assets	42,083us-gaap_DeferredTaxAssetsGross	37,013us-gaap_DeferredTaxAssetsGross
Less: Valuation allowance	(35,835)	(11,665)
Total deferred tax assets net of valuation allowance	6,248us-gaap_DeferredTaxAssetsNet	25,348us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities:
Depreciation & amortization	(4,020)	(5,567)
Other	(1,485)us-gaap_DeferredTaxLiabilitiesOther	(926)us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities	(5,505)us-gaap_DeferredIncomeTaxLiabilities	(6,493)us-gaap_DeferredIncomeTaxLiabilities
Net deferred tax assets	$ 743us-gaap_DeferredTaxAssetsLiabilitiesNet	$ 18,855us-gaap_DeferredTaxAssetsLiabilitiesNet

Deferred Tax Assets, Depreciation and Amortization

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Deferred Tax Assets, Tax Deferred Expense, Deferred Revenue

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Deferred Tax Liabilities, Depreciation and Amortization

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Amount of deferred tax liability attributable to taxable temporary differences.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences.

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

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The tax effect as of the balance sheet date of the amount of future tax deductions arising from all unused tax credit carryforwards which have been reduced by a valuation allowance.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from reserves and accruals.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Amount of deferred tax liability attributable to taxable temporary differences not separately disclosed.

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