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Shareholders' Equity Restricted Stock (Details) (USD $) | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |
Stock Issued During Period, Shares, Restricted Stock Award, Gross | 818,004 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross | 329,698 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
Stock Issued During Period, Value, Restricted Stock Award, Gross | $ 2,955,800 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross | $ 2,511,700 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross
weighted average estimated fair value of restricted stock | $ 3.61 nbs_WeightedAverageEstimatedFairValueOfRestrictedStock | $ 7.62 nbs_WeightedAverageEstimatedFairValueOfRestrictedStock

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- Definition Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Aggregate value of stock related to Restricted Stock Awards issued during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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