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Unaudited Condensed Consolidated Statements of Operations and Comprehensive Loss (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Apr. 30, 2015
Apr. 30, 2014
Unaudited Condensed Consolidated Statements of Operations and Comprehensive Loss    
Revenues, net $ 4us-gaap_SalesRevenueNet  
Cost of goods sold 9us-gaap_CostOfGoodsSold  
Gross deficit (5)us-gaap_GrossProfit  
Operating expenses:    
Research and development 1,076us-gaap_ResearchAndDevelopmentExpense 540us-gaap_ResearchAndDevelopmentExpense
Sales and marketing 1,081us-gaap_SellingAndMarketingExpense 214us-gaap_SellingAndMarketingExpense
General and administrative 1,026us-gaap_GeneralAndAdministrativeExpense 531us-gaap_GeneralAndAdministrativeExpense
Total operating expenses 3,183us-gaap_OperatingExpenses 1,285us-gaap_OperatingExpenses
Loss from operations (3,188)us-gaap_OperatingIncomeLoss (1,285)us-gaap_OperatingIncomeLoss
Other expense (436)us-gaap_OtherNonoperatingExpense  
Interest expense, net   50us-gaap_InterestIncomeExpenseNonoperatingNet
Net and comprehensive loss (3,624)us-gaap_NetIncomeLoss (1,335)us-gaap_NetIncomeLoss
Accretion on Series A convertible redeemable preferred stock (123)us-gaap_TemporaryEquityAccretionToRedemptionValueAdjustment  
Deemed dividend on Series A convertible redeemable preferred stock (116)us-gaap_RedeemablePreferredStockDividends  
Net loss available to common stockholders $ (3,863)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ (1,335)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Basic and diluted net loss available to common stockholders per share $ (0.33)us-gaap_EarningsPerShareBasicAndDiluted $ (0.14)us-gaap_EarningsPerShareBasicAndDiluted
Shares used in computing basic and diluted net loss per share 11,741,000us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 9,351,000us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted