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Consolidated Balance Sheets (Unaudited) (USD $)
In Thousands, unless otherwise specified
Mar. 28, 2015
Dec. 27, 2014
Current assets:    
Cash and cash equivalents $ 183,661us-gaap_CashAndCashEquivalentsAtCarryingValue $ 185,957us-gaap_CashAndCashEquivalentsAtCarryingValue
Short term investments 37,256us-gaap_AvailableForSaleSecuritiesCurrent 36,166us-gaap_AvailableForSaleSecuritiesCurrent
Accounts receivable, net of allowance of $67 at September 27, 2014 and December 28, 2013 37,705us-gaap_AccountsReceivableNetCurrent 71,056us-gaap_AccountsReceivableNetCurrent
Unbilled revenue 633us-gaap_UnbilledContractsReceivable 2,614us-gaap_UnbilledContractsReceivable
Inventory 49,698us-gaap_InventoryNet 47,857us-gaap_InventoryNet
Deferred tax assets 22,030us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent 21,505us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Other current assets 9,501us-gaap_OtherAssetsCurrent 9,704us-gaap_OtherAssetsCurrent
Total current assets 340,484us-gaap_AssetsCurrent 374,859us-gaap_AssetsCurrent
Property and equipment, net 30,501us-gaap_PropertyPlantAndEquipmentNet 31,297us-gaap_PropertyPlantAndEquipmentNet
Deferred tax assets 8,393us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent 8,409us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent
Goodwill 48,751us-gaap_Goodwill 48,751us-gaap_Goodwill
Finite-Lived Intangible Assets, Net 18,274us-gaap_FiniteLivedIntangibleAssetsNet 19,146us-gaap_FiniteLivedIntangibleAssetsNet
Other assets 11,265us-gaap_OtherAssetsNoncurrent 10,751us-gaap_OtherAssetsNoncurrent
Total assets 457,668us-gaap_Assets 493,213us-gaap_Assets
Current liabilities:    
Accounts payable 35,666us-gaap_AccountsPayableCurrent 60,256us-gaap_AccountsPayableCurrent
Accrued expenses 14,322us-gaap_AccruedLiabilitiesCurrent 18,701us-gaap_AccruedLiabilitiesCurrent
Employee-related Liabilities, Current 7,805us-gaap_EmployeeRelatedLiabilitiesCurrent 16,235us-gaap_EmployeeRelatedLiabilitiesCurrent
Deferred Revenue, Current 1,769us-gaap_DeferredRevenueCurrent 3,849us-gaap_DeferredRevenueCurrent
Total current liabilities 59,562us-gaap_LiabilitiesCurrent 99,041us-gaap_LiabilitiesCurrent
Long term liabilities 3,819us-gaap_LiabilitiesNoncurrent 3,736us-gaap_LiabilitiesNoncurrent
Commitments and contingencies (Note 6)      
Redeemable convertible preferred stock, 5,000,000 shares authorized and none outstanding 0us-gaap_PreferredStockValue 0us-gaap_PreferredStockValue
Common stock, $0.01 par value, 100,000,000 shares authorized; 29,599,356 and 28,935,253 shares issued and outstanding at September 27, 2014 and December 28, 2013, respectively 297us-gaap_CommonStockValue 297us-gaap_CommonStockValue
Additional paid-in capital 248,385us-gaap_AdditionalPaidInCapitalCommonStock 249,409us-gaap_AdditionalPaidInCapitalCommonStock
Retained earnings 145,635us-gaap_RetainedEarningsAccumulatedDeficit 140,881us-gaap_RetainedEarningsAccumulatedDeficit
Accumulated other comprehensive income (30)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (151)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Total stockholders' equity 394,287us-gaap_StockholdersEquity 390,436us-gaap_StockholdersEquity
Total liabilities, redeemable convertible preferred stock and stockholders' equity $ 457,668us-gaap_LiabilitiesAndStockholdersEquity $ 493,213us-gaap_LiabilitiesAndStockholdersEquity