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Stock Options and Stock Grants - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 195us-gaap_AllocatedShareBasedCompensationExpense	$ 242us-gaap_AllocatedShareBasedCompensationExpense
Total unrecognized compensation cost related to nonvested share-based compensation arrangements granted	229us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
Weighted-average period over which unrecognized compensation is expected to be recognized	1 year 8 months 12 days
Vesting period of shares	3 years	3 years
Contractual life	10 years	10 years
Estimated forfeitures	4.00%nanx_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsForfeitureRate	4.40%nanx_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsForfeitureRate
Dividend yield	0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
Closing stock price	$ 0.40nanx_CommonStockClosingPrice
Intrinsic value of stock options exercised, total	4us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	3us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
Proceeds from exercise of stock options	10us-gaap_ProceedsFromStockOptionsExercised	7us-gaap_ProceedsFromStockOptionsExercised
Stock option exercises, Shares	35,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised	23,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Tax benefits from stock options	0us-gaap_DeferredTaxExpenseFromStockOptionsExercised	0us-gaap_DeferredTaxExpenseFromStockOptionsExercised
Common stock, shares outstanding	28,516,163us-gaap_CommonStockSharesOutstanding	28,481,496us-gaap_CommonStockSharesOutstanding
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of the liability	$ 1us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember	$ 8us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares outstanding	0us-gaap_CommonStockSharesOutstanding / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember	0us-gaap_CommonStockSharesOutstanding / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares outstanding	0us-gaap_CommonStockSharesOutstanding / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember	0us-gaap_CommonStockSharesOutstanding / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember

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Common Stock Closing Price

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Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Forfeiture Rate

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested options awarded to employees as compensation.

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Number of share options (or share units) exercised during the current period.

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