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Property and Equipment Property and Equipment Narrative (Details) (USD $)
3 Months Ended
Apr. 04, 2015
Mar. 29, 2014
Jan. 03, 2015
Property, Plant and Equipment [Line Items]      
Depreciation $ 2,700,000us-gaap_Depreciation $ 2,200,000us-gaap_Depreciation  
Depreciation and amortization 3,777,000us-gaap_DepreciationDepletionAndAmortization 3,043,000us-gaap_DepreciationDepletionAndAmortization  
Property, plant and equipment, gross 167,367,000us-gaap_PropertyPlantAndEquipmentGross   159,036,000us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation 58,702,000us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment   57,084,000us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Construction-in-progress      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross 23,139,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember
  25,731,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember
Furniture and office equipment      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross 6,965,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
  4,864,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
Capital Leased Assets, Gross 600,000us-gaap_CapitalLeasedAssetsGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
  600,000us-gaap_CapitalLeasedAssetsGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
Capital Lease Obligations [Member]      
Property, Plant and Equipment [Line Items]      
Accumulated depreciation 400,000us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_CapitalLeaseObligationsMember
  400,000us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_CapitalLeaseObligationsMember
Irvine, California | Construction-in-progress      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross 20,200,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember
/ us-gaap_StatementGeographicalAxis
= stpr_CA
   
Accounts Payable | Irvine, California | Construction-in-progress      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross $ 4,100,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccountsPayableMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember
/ us-gaap_StatementGeographicalAxis
= stpr_CA