401(k) Profit-Sharing Plan - Additional Information (Detail) - USD ($)	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
Profit Sharing Plan [Abstract]
Defined contribution plan employer matching contribution percent for three percent of employee contribution	100.00%
Defined contribution plan employer matching contribution percent for first compensation	3.00%
Defined contribution plan employer matching contribution percent for two percent of employee contribution	50.00%
Defined contribution plan employer matching contribution percent for next compensation	2.00%
Contributions under profit sharing plan	$ 0	$ 0

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

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Defined Contribution Plan Employer Matching Contribution Percent For First Compensation Slab

No definition available.

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Namespace Prefix:	nanx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Defined Contribution Plan Employer Matching Contribution Percent For Next Compensation Slab

No definition available.

Name:	nanx_DefinedContributionPlanEmployerMatchingContributionPercentForNextCompensationSlab
Namespace Prefix:	nanx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Defined Contribution Plan Employer Matching Contribution Percent For Three Percent Of Employee Contribution

No definition available.

Name:	nanx_DefinedContributionPlanEmployerMatchingContributionPercentForThreePercentOfEmployeeContribution
Namespace Prefix:	nanx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Defined Contribution Plan Employer Matching Contribution Percent For Two Percent Of Employee Contribution

No definition available.

Name:	nanx_DefinedContributionPlanEmployerMatchingContributionPercentForTwoPercentOfEmployeeContribution
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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Profit Sharing Plan [Abstract]

No definition available.

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