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Income Taxes - Additional Information (Detail) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2011
Income Tax Disclosure [Abstract] |  |  |
Provision for income taxes | $ 0us-gaap_IncomeTaxExpenseBenefit | $ 0us-gaap_IncomeTaxExpenseBenefit |
Increase in valuation allowance | 700,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount | 1,000,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount |
Valuation allowance for operating loss and tax credit carryforwards | 0nanx_OperatingLossAndTaxCreditCarryForwardValuationAllowance | 0nanx_OperatingLossAndTaxCreditCarryForwardValuationAllowance |
Net operating loss carryforwards | 80,000,000us-gaap_OperatingLossCarryforwards |  |
Capital loss carryforwards |  | $ 300,000nanx_CapitalLossCarryforwards |
Capital loss carryforwards expiration period |  | 2014 |
Capital loss carryforwards expiration period start | 2018 |  |
Capital loss carryforwards expiration period end | 2034 |  |
Period for suspension of net operating loss carryforwards |  |  | 4 years
Extension of the term of net loss carryforwards |  |  | 4 years

X
- Definition Amount of capital loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References No definition available. + Details
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- Definition Extension Of Term Of Net Loss Carryforwards + References No definition available. + Details
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- Definition The portion of the valuation allowance pertaining to the deferred tax asset representing potential future taxable deductions from net operating loss and tax credit carryforwards for which it is more likely than not that a tax benefit will not be realized. + References No definition available. + Details
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- Definition Period For Suspension Of Net Operating Loss Carryforwards + References No definition available. + Details
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- Details
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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- Definition Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e32123-109318 + Details
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