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Consolidated Balance Sheets (USD $)
Oct. 31, 2014
Jul. 31, 2014
Jul. 31, 2013
Assets      
Cash and cash equivalents $ 5,331,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 86,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 32,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts receivable, net 47,000us-gaap_AccountsReceivableNetCurrent 47,000us-gaap_AccountsReceivableNetCurrent 18,000us-gaap_AccountsReceivableNetCurrent
Inventories, net 231,000us-gaap_InventoryNet 249,000us-gaap_InventoryNet 365,000us-gaap_InventoryNet
Prepaid expenses 154,000us-gaap_PrepaidExpenseCurrent 96,000us-gaap_PrepaidExpenseCurrent 71,000us-gaap_PrepaidExpenseCurrent
Total current assets 5,763,000us-gaap_AssetsCurrent 478,000us-gaap_AssetsCurrent 486,000us-gaap_AssetsCurrent
Property, plant and equipment, net 28,000us-gaap_PropertyPlantAndEquipmentNet 36,000us-gaap_PropertyPlantAndEquipmentNet 146,000us-gaap_PropertyPlantAndEquipmentNet
Patents, net 1,305,000pure_PatentsNet 1,345,000pure_PatentsNet 1,430,000pure_PatentsNet
Total assets 7,096,000us-gaap_Assets 1,859,000us-gaap_Assets 2,062,000us-gaap_Assets
Liabilities and stockholders' equity (deficit)      
Accounts payable 510,000us-gaap_AccountsPayableCurrent 1,096,000us-gaap_AccountsPayableCurrent 1,134,000us-gaap_AccountsPayableCurrent
Restructuring liability 201,000us-gaap_BridgeLoan 323,000us-gaap_BridgeLoan  
Note payable, current     368,000us-gaap_NotesPayableCurrent
Accrued liabilities 154,000us-gaap_AccruedLiabilitiesCurrent 401,000us-gaap_AccruedLiabilitiesCurrent 600,000us-gaap_AccruedLiabilitiesCurrent
Derivative liability 10,000us-gaap_DerivativeLiabilitiesCurrent 9,000us-gaap_DerivativeLiabilitiesCurrent 51,000us-gaap_DerivativeLiabilitiesCurrent
Total current liabilities 875,000us-gaap_LiabilitiesCurrent 1,829,000us-gaap_LiabilitiesCurrent 2,153,000us-gaap_LiabilitiesCurrent
Note payable, less current portion     887,000pure_NotesPayableLessCurrentPortion
Deferred rent 12,000us-gaap_DeferredRentCreditNoncurrent 13,000us-gaap_DeferredRentCreditNoncurrent 13,000us-gaap_DeferredRentCreditNoncurrent
Total liabilities 887,000us-gaap_Liabilities 1,842,000us-gaap_Liabilities 3,053,000us-gaap_Liabilities
Commitments and contingencies         
Stockholders' equity (deficit)      
Preferred stock, $0.01 par value: 5,000,000 shares authorized, no shares issued         
Common stock, $0.01 par value: 100,000,000 shares authorized 398,000us-gaap_CommonStockValue 295,000us-gaap_CommonStockValue 126,000us-gaap_CommonStockValue
Additional paid-in capital 88,966,000us-gaap_AdditionalPaidInCapitalCommonStock 80,943,000us-gaap_AdditionalPaidInCapitalCommonStock 69,054,000us-gaap_AdditionalPaidInCapitalCommonStock
Accumulated deficit (83,155,000)us-gaap_RetainedEarningsAccumulatedDeficit (81,221,000)us-gaap_RetainedEarningsAccumulatedDeficit (70,171,000)us-gaap_RetainedEarningsAccumulatedDeficit
Total stockholders' equity (deficit) 6,209,000us-gaap_StockholdersEquity 17,000us-gaap_StockholdersEquity (991,000)us-gaap_StockholdersEquity
Total liabilities and stockholders' equity (deficit) $ 7,096,000us-gaap_LiabilitiesAndStockholdersEquity $ 1,859,000us-gaap_LiabilitiesAndStockholdersEquity $ 2,062,000us-gaap_LiabilitiesAndStockholdersEquity