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Summary of Significant Accounting Policies Activity of financial instruments with significant Level 3 inputs (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Embedded Derivative Financial Instruments [Member] |  |  |
Schedule of financial instrument activity [Line Items] |  |  |
Liability Balance | $ 392 | $ 2,282 | $ 0
Convertible redeemable Series E preferred stock and warrants issued |  | 2,131 |
Change in fair value recorded in earnings | (1,890) | 151 |
Warrant [Member] |  |  |
Schedule of financial instrument activity [Line Items] |  |  |
Liability Balance | 83 | 290 | 36
Convertible redeemable Series E preferred stock and warrants issued |  | 266 |
Change in fair value recorded in earnings | $ (207) | $ (12) |

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- Definition Convertible redeemable Series E preferred stock and warrants issued + References No definition available. + Details
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Namespace Prefix: | nbs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: | nbs_
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- Definition The amount recognized in earnings related to the change in fair value during the period of derivative or nonderivative instruments designated as fair value hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 45 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition This element represents the aggregate of the liabilities reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant