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Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Mar. 31, 2014
Current assets:    
Cash and cash equivalents $ 22,401us-gaap_CashAndCashEquivalentsAtCarryingValue $ 20,916us-gaap_CashAndCashEquivalentsAtCarryingValue
Short-term marketable securities 109,557us-gaap_AvailableForSaleSecuritiesCurrent 55,663us-gaap_AvailableForSaleSecuritiesCurrent
Accounts receivable, net 31,828us-gaap_AccountsReceivableNetCurrent 24,357us-gaap_AccountsReceivableNetCurrent
Inventories 16,774us-gaap_InventoryNet 13,948us-gaap_InventoryNet
Prepaid expenses and other current assets 4,479us-gaap_PrepaidExpenseAndOtherAssetsCurrent 3,082us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Deferred tax assets, net 35,100us-gaap_DeferredTaxAssetsNetCurrent  
Total current assets 220,139us-gaap_AssetsCurrent 117,966us-gaap_AssetsCurrent
Long-term marketable securities 13,996us-gaap_AvailableForSaleSecuritiesNoncurrent 41,761us-gaap_AvailableForSaleSecuritiesNoncurrent
Property and equipment, net 9,127us-gaap_PropertyPlantAndEquipmentNet 6,889us-gaap_PropertyPlantAndEquipmentNet
Goodwill 31,534us-gaap_Goodwill 37,990us-gaap_Goodwill
In-Process Research and Development 14,711us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill  
Long-term deferred tax assets, net 45,206us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent  
Other assets 3,654us-gaap_OtherAssetsNoncurrent 801us-gaap_OtherAssetsNoncurrent
Total assets 338,367us-gaap_Assets 205,407us-gaap_Assets
Current liabilities:    
Accounts payable 10,389us-gaap_AccountsPayableCurrent 7,746us-gaap_AccountsPayableCurrent
Accrued expenses 21,894us-gaap_AccruedLiabilitiesCurrent 17,899us-gaap_AccruedLiabilitiesCurrent
Deferred revenue 7,036us-gaap_DeferredRevenueCurrent 4,766us-gaap_DeferredRevenueCurrent
Total current liabilities 39,319us-gaap_LiabilitiesCurrent 30,411us-gaap_LiabilitiesCurrent
Other long-term liabilities 183us-gaap_OtherLiabilitiesNoncurrent 228us-gaap_OtherLiabilitiesNoncurrent
Contingent consideration 6,510us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent  
Long-term deferred tax liabilities 795us-gaap_DeferredTaxLiabilitiesNoncurrent 6,415us-gaap_DeferredTaxLiabilitiesNoncurrent
Total liabilities 46,807us-gaap_Liabilities 37,054us-gaap_Liabilities
Commitments and contingencies (Note 12)      
Stockholders' equity:    
Class B Preferred Stock, $.01 par value Authorized-1,000,000 shares; Issued and outstanding-none      
Common stock, $.01 par value Authorized-100,000,000 shares; Issued-42,618,717 shares at March 31, 2015 and 41,122,695 shares at March 31, 2014; Outstanding-41,335,773 shares at March 31, 2015 and 39,916,328 shares at March 31, 2014 413us-gaap_CommonStockValue 411us-gaap_CommonStockValue
Additional paid in capital 465,046us-gaap_AdditionalPaidInCapitalCommonStock 436,136us-gaap_AdditionalPaidInCapitalCommonStock
Accumulated deficit (137,222)us-gaap_RetainedEarningsAccumulatedDeficit (250,910)us-gaap_RetainedEarningsAccumulatedDeficit
Treasury stock at cost-1,282,944 shares at March 31, 2015 and 1,206,367 shares at March 31, 2014 (19,347)us-gaap_TreasuryStockValue (16,554)us-gaap_TreasuryStockValue
Accumulated other comprehensive loss (17,330)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (730)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Total stockholders' equity 291,560us-gaap_StockholdersEquity 168,353us-gaap_StockholdersEquity
Total liabilities and stockholders' equity $ 338,367us-gaap_LiabilitiesAndStockholdersEquity $ 205,407us-gaap_LiabilitiesAndStockholdersEquity