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CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)
Jan. 31, 2015
Apr. 30, 2014
CURRENT ASSETS:    
Cash and cash equivalents $ 55,238,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 77,490,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Trade and other receivables, net 6,284,000us-gaap_AccountsReceivableNetCurrent 1,332,000us-gaap_AccountsReceivableNetCurrent
Inventories 6,148,000us-gaap_InventoryNet 5,530,000us-gaap_InventoryNet
Prepaid expenses and other current assets, net 934,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent 1,419,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Total current assets 68,604,000us-gaap_AssetsCurrent 85,771,000us-gaap_AssetsCurrent
Property and equipment, net 8,958,000us-gaap_PropertyPlantAndEquipmentNet 2,447,000us-gaap_PropertyPlantAndEquipmentNet
Other assets 1,559,000us-gaap_OtherAssetsNoncurrent 2,327,000us-gaap_OtherAssetsNoncurrent
TOTAL ASSETS 79,121,000us-gaap_Assets 90,545,000us-gaap_Assets
CURRENT LIABILITIES:    
Accounts payable 6,814,000us-gaap_AccountsPayableCurrent 2,434,000us-gaap_AccountsPayableCurrent
Accrued clinical trial and related fees 3,117,000us-gaap_OtherAccruedLiabilitiesCurrent 4,433,000us-gaap_OtherAccruedLiabilitiesCurrent
Accrued payroll and related costs 3,716,000us-gaap_EmployeeRelatedLiabilitiesCurrent 3,837,000us-gaap_EmployeeRelatedLiabilitiesCurrent
Deferred revenue, current portion 5,752,000us-gaap_DeferredRevenueCurrent 5,241,000us-gaap_DeferredRevenueCurrent
Customer deposits 8,311,000us-gaap_CustomerAdvancesCurrent 5,760,000us-gaap_CustomerAdvancesCurrent
Other current liabilities 490,000us-gaap_OtherLiabilitiesCurrent 502,000us-gaap_OtherLiabilitiesCurrent
Total current liabilities 28,200,000us-gaap_LiabilitiesCurrent 22,207,000us-gaap_LiabilitiesCurrent
Deferred revenue, less current portion 0us-gaap_DeferredRevenueNoncurrent 292,000us-gaap_DeferredRevenueNoncurrent
Other long-term liabilities 1,127,000us-gaap_OtherLiabilitiesNoncurrent 347,000us-gaap_OtherLiabilitiesNoncurrent
Commitments and contingencies      
STOCKHOLDERS' EQUITY:    
Preferred stock - $0.001 par value; authorized 5,000,000 shares; issued and outstanding - 1,180,004 and 775,000, respectively 1,000us-gaap_PreferredStockValue 1,000us-gaap_PreferredStockValue
Common stock-$0.001 par value; authorized 325,000,000 shares; issued and outstanding - 184,244,698 and 178,871,164, respectively 184,000us-gaap_CommonStockValue 179,000us-gaap_CommonStockValue
Additional paid-in-capital 491,098,000us-gaap_AdditionalPaidInCapital 470,785,000us-gaap_AdditionalPaidInCapital
Accumulated deficit (441,489,000)us-gaap_RetainedEarningsAccumulatedDeficit (403,266,000)us-gaap_RetainedEarningsAccumulatedDeficit
Total stockholders' equity 49,794,000us-gaap_StockholdersEquity 67,699,000us-gaap_StockholdersEquity
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY $ 79,121,000us-gaap_LiabilitiesAndStockholdersEquity $ 90,545,000us-gaap_LiabilitiesAndStockholdersEquity