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Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Dec. 27, 2014
Dec. 28, 2013
Current assets:    
Cash and cash equivalents $ 34,676us-gaap_CashAndCashEquivalentsAtCarryingValue $ 44,765us-gaap_CashAndCashEquivalentsAtCarryingValue
Marketable securities 49,286us-gaap_ShortTermInvestments 48,097us-gaap_ShortTermInvestments
Accounts receivable, net of allowances of $253 and $293, respectively 26,121us-gaap_AccountsReceivableNetCurrent 31,436us-gaap_AccountsReceivableNetCurrent
Inventories 35,105us-gaap_InventoryNet 34,520us-gaap_InventoryNet
Inventories-delivered systems 1,912nano_InventoriesDeliveredSystems 6,901nano_InventoriesDeliveredSystems
Prepaid expenses and other 9,289us-gaap_PrepaidExpenseAndOtherAssetsCurrent 10,519us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Deferred income tax assets 1,457us-gaap_DeferredTaxAssetsNetCurrent 14,516us-gaap_DeferredTaxAssetsNetCurrent
Total current assets 157,846us-gaap_AssetsCurrent 190,754us-gaap_AssetsCurrent
Property, plant and equipment, net 49,633us-gaap_PropertyPlantAndEquipmentNet 47,439us-gaap_PropertyPlantAndEquipmentNet
Goodwill 10,494us-gaap_Goodwill 11,743us-gaap_Goodwill
Intangible assets, net 4,294us-gaap_IntangibleAssetsNetExcludingGoodwill 7,864us-gaap_IntangibleAssetsNetExcludingGoodwill
Deferred income tax assets 410us-gaap_DeferredTaxAssetsNetNoncurrent 4,338us-gaap_DeferredTaxAssetsNetNoncurrent
Other assets 559us-gaap_OtherAssetsNoncurrent 696us-gaap_OtherAssetsNoncurrent
Total assets 223,236us-gaap_Assets 262,834us-gaap_Assets
Current liabilities:    
Accounts payable 10,199us-gaap_AccountsPayableCurrent 10,604us-gaap_AccountsPayableCurrent
Accrued payroll and related expenses 8,700us-gaap_EmployeeRelatedLiabilitiesCurrent 7,853us-gaap_EmployeeRelatedLiabilitiesCurrent
Deferred revenue 10,021us-gaap_DeferredRevenueCurrent 21,749us-gaap_DeferredRevenueCurrent
Other current liabilities 8,265us-gaap_OtherLiabilitiesCurrent 7,993us-gaap_OtherLiabilitiesCurrent
Income taxes payable 1,017us-gaap_AccruedIncomeTaxesCurrent 758us-gaap_AccruedIncomeTaxesCurrent
Total current liabilities 38,202us-gaap_LiabilitiesCurrent 48,957us-gaap_LiabilitiesCurrent
Deferred revenue 2,591us-gaap_DeferredRevenueNoncurrent 3,718us-gaap_DeferredRevenueNoncurrent
Income taxes payable 701us-gaap_TaxesPayableCurrent 1,171us-gaap_TaxesPayableCurrent
Deferred tax liability 926us-gaap_DeferredTaxLiabilitiesNoncurrent 0us-gaap_DeferredTaxLiabilitiesNoncurrent
Other long-term liabilities 1,279us-gaap_OtherLiabilitiesNoncurrent 1,615us-gaap_OtherLiabilitiesNoncurrent
Total liabilities 43,699us-gaap_Liabilities 55,461us-gaap_Liabilities
Commitments and contingencies (Note 11)      
Stockholders’ equity:    
Preferred stock, $0.001 par value; 3,000,000 shares authorized; no shares issued or outstanding 0us-gaap_PreferredStockValue 0us-gaap_PreferredStockValue
Common stock, $0.001 par value, 47,000,000 shares authorized: 23,813,729 and 23,537,275, respectively, issued and outstanding 24us-gaap_CommonStockValue 24us-gaap_CommonStockValue
Additional paid-in capital 251,396us-gaap_AdditionalPaidInCapital 244,733us-gaap_AdditionalPaidInCapital
Accumulated deficit (69,114)us-gaap_RetainedEarningsAccumulatedDeficit (37,996)us-gaap_RetainedEarningsAccumulatedDeficit
Accumulated other comprehensive income (2,769)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 612us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Total stockholders’ equity 179,537us-gaap_StockholdersEquity 207,373us-gaap_StockholdersEquity
Total liabilities and stockholders’ equity $ 223,236us-gaap_LiabilitiesAndStockholdersEquity $ 262,834us-gaap_LiabilitiesAndStockholdersEquity