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Inventory (Details) (USD $)
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12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| Inventory Disclosure [Abstract] | |||
| Obsolescence reserve | $ 539,000us-gaap_InventoryValuationReserves | $ 0us-gaap_InventoryValuationReserves | |
| Capitalized inventory costs | 110,000navb_OtherInventoryCapitalizedCostsDuration | 2,400,000navb_OtherInventoryCapitalizedCostsDuration | |
| Inventory write offs | 198,000navb_InventoryWriteDownToResearchAndDevelopment | 298,000navb_InventoryWriteDownToResearchAndDevelopment | |
| Inventory Write-down | $ 539,027us-gaap_InventoryWriteDown | $ 0us-gaap_InventoryWriteDown | $ 0us-gaap_InventoryWriteDown |
| X | ||||||||||
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- Definition
Charge to research and development that represents the reduction of the carrying amount of inventory. No definition available.
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| X | ||||||||||
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- Definition
Gross amount of expenditures incurred during the period which are not expensed in the period but rather are capitalized as a component of inventory. No definition available.
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Amount of valuation reserve for inventory. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Charge to cost of goods sold that represents the reduction of the carrying amount of inventory, generally attributable to obsolescence or market conditions. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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