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401(k) Profit-Sharing Plan - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	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

X

- Definition

Amount of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	nanx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- 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

X

- 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

X

- Details

Name:	nanx_ProfitSharingPlanAbstract
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Data Type:	xbrli:stringItemType
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Period Type:	duration