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401(k) Profit-Sharing Plan - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Profit Sharing Plan [Abstract] |  |
Defined contribution plan employer matching contribution percent for three percent of employee contribution | 100.00%nanx_DefinedContributionPlanEmployerMatchingContributionPercentForThreePercentOfEmployeeContribution |
Defined contribution plan employer matching contribution percent for first compensation | 3.00%nanx_DefinedContributionPlanEmployerMatchingContributionPercentForFirstCompensationSlab |
Defined contribution plan employer matching contribution percent for two percent of employee contribution | 50.00%nanx_DefinedContributionPlanEmployerMatchingContributionPercentForTwoPercentOfEmployeeContribution |
Defined contribution plan employer matching contribution percent for next compensation | 2.00%nanx_DefinedContributionPlanEmployerMatchingContributionPercentForNextCompensationSlab |
Contributions under profit sharing plan | $ 0nanx_DefinedContributionPlanEmployerMatchingContributionAmount | $ 109nanx_DefinedContributionPlanEmployerMatchingContributionAmount

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- Definition Amount of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | nanx_DefinedContributionPlanEmployerMatchingContributionAmount
Namespace Prefix: | nanx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Defined Contribution Plan Employer Matching Contribution Percent For First Compensation Slab + References No definition available. + Details
Name: | nanx_DefinedContributionPlanEmployerMatchingContributionPercentForFirstCompensationSlab
Namespace Prefix: | nanx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Defined Contribution Plan Employer Matching Contribution Percent For Next Compensation Slab + References No definition available. + Details
Name: | nanx_DefinedContributionPlanEmployerMatchingContributionPercentForNextCompensationSlab
Namespace Prefix: | nanx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Defined Contribution Plan Employer Matching Contribution Percent For Three Percent Of Employee Contribution + References No definition available. + Details
Name: | nanx_DefinedContributionPlanEmployerMatchingContributionPercentForThreePercentOfEmployeeContribution
Namespace Prefix: | nanx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Defined Contribution Plan Employer Matching Contribution Percent For Two Percent Of Employee Contribution + References No definition available. + Details
Name: | nanx_DefinedContributionPlanEmployerMatchingContributionPercentForTwoPercentOfEmployeeContribution
Namespace Prefix: | nanx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | nanx_ProfitSharingPlanAbstract
Namespace Prefix: | nanx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration