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Condensed Consolidated Balance Sheets (USD $)
Jan. 31, 2015
Apr. 30, 2014
Current assets:    
Cash and cash equivalents $ 45,787,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 31,934,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Restricted cash   604,000us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
Short-term investments 59,008,000us-gaap_ShortTermInvestments 40,700,000us-gaap_ShortTermInvestments
Accounts receivable, net of allowance for doubtful accounts of $3,418 and $2,324 as of January 31, 2015 and April 30, 2014, respectively 55,730,000us-gaap_AccountsReceivableNetCurrent 39,099,000us-gaap_AccountsReceivableNetCurrent
Prepaid expenses and other current assets 14,448,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent 8,212,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Assets held for sale 0us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent 33,745,000us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent
Total current assets 174,973,000us-gaap_AssetsCurrent 154,294,000us-gaap_AssetsCurrent
Property, equipment and capitalized internal-use software development costs, net 18,246,000us-gaap_PropertyPlantAndEquipmentNet 17,005,000us-gaap_PropertyPlantAndEquipmentNet
Goodwill 139,155,000us-gaap_Goodwill 139,155,000us-gaap_Goodwill
Acquired intangible assets, net 11,970,000us-gaap_IntangibleAssetsNetExcludingGoodwill 13,388,000us-gaap_IntangibleAssetsNetExcludingGoodwill
Other non-current assets 3,884,000us-gaap_OtherAssetsNoncurrent 3,428,000us-gaap_OtherAssetsNoncurrent
Total assets 348,228,000us-gaap_Assets 327,270,000us-gaap_Assets
Current liabilities:    
Accounts payable 4,393,000us-gaap_AccountsPayableCurrent 3,346,000us-gaap_AccountsPayableCurrent
Accrued expenses and other current liabilities 26,229,000us-gaap_OtherLiabilitiesCurrent 27,071,000us-gaap_OtherLiabilitiesCurrent
Revolving line of credit   27,000,000us-gaap_LinesOfCreditCurrent
Deferred revenue 60,814,000us-gaap_DeferredRevenueCurrent 54,951,000us-gaap_DeferredRevenueCurrent
Liabilities held for sale   3,621,000us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent
Total current liabilities 91,436,000us-gaap_LiabilitiesCurrent 115,989,000us-gaap_LiabilitiesCurrent
Long-term liabilities:    
Revolving line of credit 57,000,000us-gaap_LongTermLineOfCredit  
Deferred revenue less current portion 2,669,000us-gaap_DeferredRevenueNoncurrent 1,722,000us-gaap_DeferredRevenueNoncurrent
Deferred tax liability, long-term 1,662,000us-gaap_DeferredTaxLiabilitiesNoncurrent 1,730,000us-gaap_DeferredTaxLiabilitiesNoncurrent
Other liabilities, long-term 360,000us-gaap_OtherLiabilitiesNoncurrent 1,367,000us-gaap_OtherLiabilitiesNoncurrent
Total liabilities 153,127,000us-gaap_Liabilities 120,808,000us-gaap_Liabilities
Commitments and contingencies (Note 11)      
Stockholders' equity:    
Common stock - $0.0001 par value; 150,000,000 shares authorized, 79,629,679 shares issued and 79,379,679 shares outstanding as of January 31, 2015; 150,000,000 shares authorized, 77,887,663 shares issued and 77,637,663 shares outstanding at April 30, 2014 8,000us-gaap_CommonStockValue 8,000us-gaap_CommonStockValue
Treasury stock, at cost - 250,000 shares as of January 31, 2015 and April 30, 2014 0us-gaap_TreasuryStockValue 0us-gaap_TreasuryStockValue
Additional paid-in capital 413,443,000us-gaap_AdditionalPaidInCapitalCommonStock 398,201,000us-gaap_AdditionalPaidInCapitalCommonStock
Accumulated other comprehensive income (loss) (679,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 328,000us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Accumulated deficit (217,671,000)us-gaap_RetainedEarningsAccumulatedDeficit (192,075,000)us-gaap_RetainedEarningsAccumulatedDeficit
Total stockholders' equity 195,101,000us-gaap_StockholdersEquity 206,462,000us-gaap_StockholdersEquity
Total liabilities and stockholders' equity $ 348,228,000us-gaap_LiabilitiesAndStockholdersEquity $ 327,270,000us-gaap_LiabilitiesAndStockholdersEquity