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CONSOLIDATED BALANCE SHEETS (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Current assets:    
Cash and cash equivalents $ 77,824us-gaap_CashAndCashEquivalentsAtCarryingValue $ 107,773us-gaap_CashAndCashEquivalentsAtCarryingValue
Short-term investments 2,299us-gaap_OtherMarketableSecuritiesCurrent   
Accounts receivable, net of allowances for doubtful accounts of $10,877 and $11,063, respectively 16,690us-gaap_AccountsReceivableNetCurrent 23,260us-gaap_AccountsReceivableNetCurrent
Inventories 20,659us-gaap_InventoryNet 23,355us-gaap_InventoryNet
Deferred costs 55,257us-gaap_DeferredCostsCurrent 86,723us-gaap_DeferredCostsCurrent
Prepaids and other current assets 19,337us-gaap_PrepaidExpenseAndOtherAssetsCurrent 21,552us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Short-term restricted cash 13,731us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue 9,822us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
Total current assets 205,797us-gaap_AssetsCurrent 272,485us-gaap_AssetsCurrent
Property, plant and equipment, net 3,037us-gaap_PropertyPlantAndEquipmentNet 4,771us-gaap_PropertyPlantAndEquipmentNet
Long-term investments 59,799us-gaap_LongTermInvestments 74,588us-gaap_LongTermInvestments
Long-term deferred costs 4,956us-gaap_DeferredCosts 8,539us-gaap_DeferredCosts
Long-term deferred tax assets 985us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent 590us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent
Other long-term assets 4,489us-gaap_OtherAssetsNoncurrent 5,994us-gaap_OtherAssetsNoncurrent
Total assets 279,063us-gaap_Assets 366,967us-gaap_Assets
Current liabilities:    
Accounts payable 29,769us-gaap_AccountsPayableCurrent 24,953us-gaap_AccountsPayableCurrent
Income taxes payable 7,463us-gaap_AccruedIncomeTaxesCurrent 11,827us-gaap_AccruedIncomeTaxesCurrent
Customer advances 49,244us-gaap_CustomerAdvancesCurrent 75,670us-gaap_CustomerAdvancesCurrent
Deferred revenue 26,819us-gaap_DeferredRevenueCurrent 29,093us-gaap_DeferredRevenueCurrent
Deferred tax liabilities 656us-gaap_DeferredTaxLiabilitiesCurrent 577us-gaap_DeferredTaxLiabilitiesCurrent
Other current liabilities 15,463us-gaap_OtherLiabilitiesCurrent 22,430us-gaap_OtherLiabilitiesCurrent
Total current liabilities 129,414us-gaap_LiabilitiesCurrent 164,550us-gaap_LiabilitiesCurrent
Long-term deferred revenue 18,304us-gaap_DeferredRevenueNoncurrent 35,251us-gaap_DeferredRevenueNoncurrent
Other long-term liabilities 16,016us-gaap_OtherLiabilitiesNoncurrent 16,786us-gaap_OtherLiabilitiesNoncurrent
Total liabilities 163,734us-gaap_Liabilities 216,587us-gaap_Liabilities
Commitments and contingencies (Note 8)      
Shareholders' equity:    
Ordinary shares: $0.00375 par value; 250,000 authorized shares; 38,314 and 45,444 shares issued at December 31, 2014 and December 31, 2013, respectively; 38,148 and 39,778 shares outstanding at December 31, 2014 and December 31, 2013, respectively (Note 1) 122us-gaap_CommonStockValue 151us-gaap_CommonStockValue
Additional paid-in capital 1,258,182us-gaap_AdditionalPaidInCapitalCommonStock 1,280,810us-gaap_AdditionalPaidInCapitalCommonStock
Treasury stock, at cost: 166 and 5,666 shares at December 31, 2014 and December 31, 2013, respectively (443)us-gaap_TreasuryStockValue (20,421)us-gaap_TreasuryStockValue
Accumulated deficit (1,206,286)us-gaap_RetainedEarningsAccumulatedDeficit (1,176,022)us-gaap_RetainedEarningsAccumulatedDeficit
Accumulated other comprehensive income 63,754us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 65,862us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Total shareholders' equity 115,329us-gaap_StockholdersEquity 150,380us-gaap_StockholdersEquity
Total liabilities and equity $ 279,063us-gaap_LiabilitiesAndStockholdersEquity $ 366,967us-gaap_LiabilitiesAndStockholdersEquity