v2.4.1.9
CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (DEFICIENCY) (USD $)
In Thousands, except Share data
Preferred stock
Common stock
Additional paid-in capital
Accumulated Deficit
Total
Balance at Dec. 31, 2013    [1]    [1] $ 10,906us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 $ (14,203)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember		 $ (3,297)us-gaap_StockholdersEquity
Balance, Shares at Dec. 31, 2013 394,232us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember		 155,009us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		      
Stock-based compensation related to options granted to consultants and employees       3us-gaap_StockOptionPlanExpense
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		    3us-gaap_StockOptionPlanExpense
Benefit component of convertible notes       52naov_BenefitComponentOfConvertibleNotes
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		    52naov_BenefitComponentOfConvertibleNotes
Total comprehensive loss          (503)us-gaap_ComprehensiveIncomeNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember		 (503)us-gaap_ComprehensiveIncomeNetOfTax
Balance at Mar. 31, 2014    [1]    [1] 10,961us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 (14,706)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember		 (3,745)us-gaap_StockholdersEquity
Balance, Shares at Mar. 31, 2014 394,232us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember		 155,009us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		      
Balance at Dec. 31, 2013    [1]    [1] 10,906us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 (14,203)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember		 (3,297)us-gaap_StockholdersEquity
Balance, Shares at Dec. 31, 2013 394,232us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember		 155,009us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		      
Exercise of options       [1]          [1]
Exercise of options, Shares    8,571us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		      
Stock-based compensation related to options granted to consultants and employees       24us-gaap_StockOptionPlanExpense
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		    24us-gaap_StockOptionPlanExpense
Benefit component of convertible notes       [1] 304naov_BenefitComponentOfConvertibleNotes
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		    304naov_BenefitComponentOfConvertibleNotes
Total comprehensive loss          (2,647)us-gaap_ComprehensiveIncomeNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember		 (2,647)us-gaap_ComprehensiveIncomeNetOfTax
Balance at Dec. 31, 2014    [1]    [1] 11,234us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 (16,850)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember		 (5,616)us-gaap_StockholdersEquity
Balance, Shares at Dec. 31, 2014 394,232us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember		 163,580us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		      
Issuance of Common stock, net of issuance costs       [1] 511us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		    511us-gaap_StockIssuedDuringPeriodValueNewIssues
Issuance of Common stock, net of issuance costs, Shares    216,667us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		      
Issuance of Preferred C stock, net of issuance costs    [1]    1,964naov_PreferredStockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		    1,964naov_PreferredStockIssuedDuringPeriodValueNewIssues
Issuance of Preferred C stock, net of issuance costs, Shares 833,333naov_PreferredStockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember		         
Issuance of warrants to Common stock       446us-gaap_ProceedsFromIssuanceOfWarrants
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		    446us-gaap_ProceedsFromIssuanceOfWarrants
Conversion of Promissory Notes into Preferred B-1 stock and Preferred C stock 1us-gaap_DebtConversionConvertedInstrumentAmount1
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember		    1,358us-gaap_DebtConversionConvertedInstrumentAmount1
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		    1,359us-gaap_DebtConversionConvertedInstrumentAmount1
Conversion of Promissory Notes into Preferred B-1 stock and Preferred C stock, Shares 683,650us-gaap_DebtConversionConvertedInstrumentSharesIssued1
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember		         
Conversion of Promissory Notes into Preferred B-2 stock and Preferred C stock 2naov_DebtConversionConvertedInstrumentAmount2
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember		    2,099naov_DebtConversionConvertedInstrumentAmount2
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		    2,101naov_DebtConversionConvertedInstrumentAmount2
Conversion of Promissory Notes into Preferred B-2 stock and Preferred C stock, Shares 1,508,001naov_DebtConversionConvertedInstrumentSharesIssued2
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember		         
Issuance of warrants to consultant       84us-gaap_IssuanceOfStockAndWarrantsForServicesOrClaims
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		    84us-gaap_IssuanceOfStockAndWarrantsForServicesOrClaims
Stock-based compensation related to options granted to consultants and employees       10us-gaap_StockOptionPlanExpense
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		    10us-gaap_StockOptionPlanExpense
Total comprehensive loss          (630)us-gaap_ComprehensiveIncomeNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember		 (630)us-gaap_ComprehensiveIncomeNetOfTax
Balance at Mar. 31, 2015 $ 3us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember		    [1] $ 17,706us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 $ (17,480)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember		 $ 229us-gaap_StockholdersEquity
Balance, Shares at Mar. 31, 2015 3,419,216us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember		 380,247us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		      
[1] Represents an amount lower than $ 1 thousands.