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CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Mar. 31, 2014
Current assets:    
Cash and cash equivalents $ 19,478us-gaap_CashAndCashEquivalentsAtCarryingValue $ 20,916us-gaap_CashAndCashEquivalentsAtCarryingValue
Short-term marketable securities 93,946us-gaap_AvailableForSaleSecuritiesCurrent 55,663us-gaap_AvailableForSaleSecuritiesCurrent
Accounts receivable, net 28,373us-gaap_AccountsReceivableNetCurrent 24,357us-gaap_AccountsReceivableNetCurrent
Inventories 15,444us-gaap_InventoryNet 13,948us-gaap_InventoryNet
Prepaid expenses and other current assets 3,331us-gaap_PrepaidExpenseAndOtherAssetsCurrent 3,082us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Total current assets 160,572us-gaap_AssetsCurrent 117,966us-gaap_AssetsCurrent
Long-term marketable securities 17,982us-gaap_AvailableForSaleSecuritiesNoncurrent 41,761us-gaap_AvailableForSaleSecuritiesNoncurrent
Property and equipment, net 7,583us-gaap_PropertyPlantAndEquipmentNet 6,889us-gaap_PropertyPlantAndEquipmentNet
Goodwill 35,327us-gaap_Goodwill 37,990us-gaap_Goodwill
In-Process Research and Development 16,480us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill 0us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
Long-term deferred tax assets 778us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent  
Other assets 2,051us-gaap_OtherAssetsNoncurrent 801us-gaap_OtherAssetsNoncurrent
Total assets 240,773us-gaap_Assets 205,407us-gaap_Assets
Current liabilities:    
Accounts payable 8,249us-gaap_AccountsPayableCurrent 7,746us-gaap_AccountsPayableCurrent
Accrued expenses 16,561us-gaap_AccruedLiabilitiesCurrent 17,899us-gaap_AccruedLiabilitiesCurrent
Deferred revenue 6,595us-gaap_DeferredRevenueCurrent 4,766us-gaap_DeferredRevenueCurrent
Total current liabilities 31,405us-gaap_LiabilitiesCurrent 30,411us-gaap_LiabilitiesCurrent
Other long-term liabilities 196us-gaap_OtherLiabilitiesNoncurrent 228us-gaap_OtherLiabilitiesNoncurrent
Contingent consideration 6,365us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent  
Long-term deferred tax liabilities 7,089us-gaap_DeferredTaxLiabilitiesNoncurrent 6,415us-gaap_DeferredTaxLiabilitiesNoncurrent
Total liabilities 45,055us-gaap_Liabilities 37,054us-gaap_Liabilities
Commitments and contingencies (Note 10)      
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 - 42,333,276 shares at December 31, 2014 and 41,122,695 shares at March 31, 2014; Outstanding - 41,079,333 shares at December 31, 2014 and 39,916,328 shares at March 31, 2014 422us-gaap_CommonStockValue 411us-gaap_CommonStockValue
Additional paid in capital 457,891us-gaap_AdditionalPaidInCapital 436,136us-gaap_AdditionalPaidInCapital
Accumulated deficit (236,096)us-gaap_RetainedEarningsAccumulatedDeficit (250,910)us-gaap_RetainedEarningsAccumulatedDeficit
Treasury stock at cost - 1,253,943 shares at December 31, 2014 and 1,206,367 shares at March 31, 2014 (17,567)us-gaap_TreasuryStockValue (16,554)us-gaap_TreasuryStockValue
Accumulated other comprehensive loss (8,932)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (730)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Total stockholders' equity 195,718us-gaap_StockholdersEquity 168,353us-gaap_StockholdersEquity
Total liabilities and stockholders' equity $ 240,773us-gaap_LiabilitiesAndStockholdersEquity $ 205,407us-gaap_LiabilitiesAndStockholdersEquity