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Condensed Consolidated Balance Sheets (USD $)
Jan. 31, 2015
Jul. 31, 2014
Current assets    
Cash and cash equivalents $ 3,908,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 86,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts receivable, net 40,000us-gaap_AccountsReceivableNetCurrent 47,000us-gaap_AccountsReceivableNetCurrent
Inventories, net 186,000us-gaap_InventoryNet 249,000us-gaap_InventoryNet
Prepaid expenses 75,000us-gaap_PrepaidExpenseCurrent 96,000us-gaap_PrepaidExpenseCurrent
Total current assets 4,209,000us-gaap_AssetsCurrent 478,000us-gaap_AssetsCurrent
Property, plant and equipment, net 90,000us-gaap_PropertyPlantAndEquipmentNet 36,000us-gaap_PropertyPlantAndEquipmentNet
Patents, net 1,262,000us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill 1,345,000us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
Total assets 5,561,000us-gaap_Assets 1,859,000us-gaap_Assets
Current liabilities    
Accounts payable 510,000us-gaap_AccountsPayableCurrent 1,096,000us-gaap_AccountsPayableCurrent
Restructuring liability 103,000us-gaap_RestructuringReserveNoncurrent 323,000us-gaap_RestructuringReserveNoncurrent
Accrued liabilities 199,000us-gaap_AccruedLiabilitiesCurrent 401,000us-gaap_AccruedLiabilitiesCurrent
Derivative liability 5,000us-gaap_DerivativeLiabilitiesCurrent 9,000us-gaap_DerivativeLiabilitiesCurrent
Total current liabilities 817,000us-gaap_LiabilitiesCurrent 1,829,000us-gaap_LiabilitiesCurrent
Deferred rent 11,000us-gaap_DeferredRentCreditNoncurrent 13,000us-gaap_DeferredRentCreditNoncurrent
Total liabilities 828,000us-gaap_Liabilities 1,842,000us-gaap_Liabilities
Commitments and contingencies (See Note 6)      
Stockholders' equity    
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, 40,120,965 shares issued and outstanding at January 31, 2015, and 29,394,940 shares issued and outstanding at July 31, 2014 402,000us-gaap_CommonStockValue 295,000us-gaap_CommonStockValue
Additional paid-in capital 89,222,000us-gaap_AdditionalPaidInCapitalCommonStock 80,943,000us-gaap_AdditionalPaidInCapitalCommonStock
Accumulated deficit (84,891,000)us-gaap_RetainedEarningsAccumulatedDeficit (81,221,000)us-gaap_RetainedEarningsAccumulatedDeficit
Total stockholders' equity 4,733,000us-gaap_StockholdersEquity 17,000us-gaap_StockholdersEquity
Total liabilities and stockholders' equity $ 5,561,000us-gaap_LiabilitiesAndStockholdersEquity $ 1,859,000us-gaap_LiabilitiesAndStockholdersEquity