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CONSOLIDATED BALANCE SHEETS (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
CURRENT ASSETS:    
Cash and cash equivalents $ 125,189us-gaap_CashAndCashEquivalentsAtCarryingValue $ 45,418us-gaap_CashAndCashEquivalentsAtCarryingValue
Short-term investments 203,339us-gaap_ShortTermInvestments 243,088us-gaap_ShortTermInvestments
Accounts receivable 18,164us-gaap_AccountsReceivableNetCurrent 22,075us-gaap_AccountsReceivableNetCurrent
Inventory 38,967us-gaap_InventoryFinishedGoods 37,109us-gaap_InventoryFinishedGoods
Deferred income taxes 18,028us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent 18,459us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Other current assets 3,653us-gaap_OtherAssetsCurrent 4,356us-gaap_OtherAssetsCurrent
Total current assets 407,340us-gaap_AssetsCurrent 370,505us-gaap_AssetsCurrent
PROPERTY AND EQUIPMENT, net of accumulated depreciation of $25,515 and $24,813 20,485us-gaap_PropertyPlantAndEquipmentNet 19,922us-gaap_PropertyPlantAndEquipmentNet
ACQUIRED TECHNOLOGY, net of accumulated amortization of $46,588 and $43,838 80,264us-gaap_FiniteLivedIntangibleAssetsNet 83,014us-gaap_FiniteLivedIntangibleAssetsNet
INVESTMENTS 4,034us-gaap_LongTermInvestments 3,047us-gaap_LongTermInvestments
DEFERRED INCOME TAXES 12,936us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent 12,934us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent
OTHER ASSETS 405us-gaap_OtherAssetsNoncurrent 425us-gaap_OtherAssetsNoncurrent
TOTAL ASSETS 525,464us-gaap_Assets 489,847us-gaap_Assets
CURRENT LIABILITIES:    
Accounts payable 6,184us-gaap_AccountsPayableCurrent 9,260us-gaap_AccountsPayableCurrent
Accrued expenses 7,525us-gaap_AccruedLiabilitiesCurrent 14,986us-gaap_AccruedLiabilitiesCurrent
Deferred revenue 25,626us-gaap_DeferredRevenueCurrent 2,466us-gaap_DeferredRevenueCurrent
Other current liabilities 56us-gaap_OtherLiabilitiesCurrent 111us-gaap_OtherLiabilitiesCurrent
Total current liabilities 39,391us-gaap_LiabilitiesCurrent 26,823us-gaap_LiabilitiesCurrent
DEFERRED REVENUE 25,411us-gaap_DeferredRevenueNoncurrent 3,366us-gaap_DeferredRevenueNoncurrent
RETIREMENT PLAN BENEFIT LIABILITY 11,265us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent 10,916us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent
Total liabilities 76,067us-gaap_Liabilities 41,105us-gaap_Liabilities
COMMITMENTS AND CONTINGENCIES (Note 13)     
SHAREHOLDERS' EQUITY:    
Preferred Stock, par value $0.01 per share, 5,000,000 shares authorized, 200,000 shares of Series A Nonconvertible Preferred Stock issued and outstanding (liquidation value of $7.50 per share or $1,500) 2us-gaap_PreferredStockValue 2us-gaap_PreferredStockValue
Common Stock, par value $0.01 per share, 100,000,000 shares authorized, 47,379,579 and 47,061,826 shares issued and outstanding at March 31, 2015 and December 31, 2014, respectively 474us-gaap_CommonStockValue 471us-gaap_CommonStockValue
Additional paid-in capital 580,282us-gaap_AdditionalPaidInCapital 581,114us-gaap_AdditionalPaidInCapital
Accumulated deficit (86,991)us-gaap_RetainedEarningsAccumulatedDeficit (88,305)us-gaap_RetainedEarningsAccumulatedDeficit
Accumulated other comprehensive loss (4,212)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (4,382)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Treasury stock, at cost (1,357,863 shares at March 31, 2015 and December 31, 2014, respectively) (40,158)us-gaap_TreasuryStockValue (40,158)us-gaap_TreasuryStockValue
Total shareholders’ equity 449,397us-gaap_StockholdersEquity 448,742us-gaap_StockholdersEquity
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY $ 525,464us-gaap_LiabilitiesAndStockholdersEquity $ 489,847us-gaap_LiabilitiesAndStockholdersEquity