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Shareholders' Equity Stock options and warrants (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014
Stock Options and Warrants [Line Items] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value | $ 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue | $ 28,600 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
Common Stock Warrants, Shares | 3,545,756 nbs_CommonStockWarrantsShares | 3,550,956 nbs_CommonStockWarrantsShares
Weighted Average Exercise Price, Warrants Outstanding | 14.12 nbs_WeightedAverageExercisePriceWarrantsOutstanding | 14.12 nbs_WeightedAverageExercisePriceWarrantsOutstanding
Weighted Average Remaining Contractual Term warrant outstanding | 1 year 10 months 17 days | 2 years 1 month 13 days
Aggregate Intrinsic Value, Warrants Outstanding | 0 nbs_AggregateIntrinsicValueWarrantsOutstanding | 1,000 nbs_AggregateIntrinsicValueWarrantsOutstanding
Warrants Granted | 0 nbs_WarrantsGranted |
Warrants Canceled | 5,200 nbs_WarrantsCanceled |
Weighted Average Exercise Price, Warrants Granted | $ 0.00 nbs_WeightedAverageExercisePriceWarrantsGranted |
Warrants Exercised | 0 nbs_WarrantsExercised |
Weighted Average Exercise Price, Warrants Exercised | $ 0.00 nbs_WeightedAverageExercisePriceWarrantsExercised |
Warrants Expired | 0 nbs_WarrantsExpired |
Weighted Average Exercise Price, Warrants Expired | $ 0.00 nbs_WeightedAverageExercisePriceWarrantsExpired |
Weighted Average Exercise Price, Warrants Canceled | $ 14.20 nbs_WeightedAverageExercisePriceWarrantsCanceled |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue |
shares, vested and expected to vest | 3,545,756 nbs_Sharesvestedandexpectedtovest |
Weighted Average Exercise Price, Warrants vested & expected to vest | 14.12 nbs_WeightedAverageExercisePriceWarrantsvestedexpectedtovest |
Aggregate Intrinsic Value, Warrants vested and expected to vest | 0 nbs_AggregateIntrinsicValueWarrantsvestedandexpectedtovest |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number | 3,545,756 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber |
Weighted Average Exercise Price, Warrants Exercisable | 14.13 nbs_WeightedAverageExercisePriceWarrantsExercisable |
weighted Average Remaining Contractual Term, warrants vested | 1 year 10 months 17 days |
Aggregate Intrinsic Value, Warrants vested | $ 0 nbs_AggregateIntrinsicValueWarrantsvested |
US Equity Plan [Member] |  |
Stock Options and Warrants [Line Items] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | 6,371,533 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / nbs_StockOptionsActivityAxis = nbs_UsEquityPlanMember | 4,427,234 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / nbs_StockOptionsActivityAxis = nbs_UsEquityPlanMember
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price | $ 7.41 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / nbs_StockOptionsActivityAxis = nbs_UsEquityPlanMember | $ 9.19 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / nbs_StockOptionsActivityAxis = nbs_UsEquityPlanMember
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term | 7 years 8 months 12 days | 6 years 11 months 5 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures | 2,121,488 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / nbs_StockOptionsActivityAxis = nbs_UsEquityPlanMember |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ 3.68 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / nbs_StockOptionsActivityAxis = nbs_UsEquityPlanMember |
Stock Options Exercised | 0 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / nbs_StockOptionsActivityAxis = nbs_UsEquityPlanMember |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price | $ 0.00 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice / nbs_StockOptionsActivityAxis = nbs_UsEquityPlanMember |
Stock Options Expired | (81,097)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod / nbs_StockOptionsActivityAxis = nbs_UsEquityPlanMember |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price | $ 6.92 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice / nbs_StockOptionsActivityAxis = nbs_UsEquityPlanMember |
Stock Options Forfeited | (96,092)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod / nbs_StockOptionsActivityAxis = nbs_UsEquityPlanMember |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price | $ 7.18 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice / nbs_StockOptionsActivityAxis = nbs_UsEquityPlanMember |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number | 5,841,147 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber / nbs_StockOptionsActivityAxis = nbs_UsEquityPlanMember |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price | $ 7.67 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice / nbs_StockOptionsActivityAxis = nbs_UsEquityPlanMember |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term | 7 years 6 months 7 days |
Weighted Average Remaining Contractual Term, Warrants Vested and Expect to Vest | 1 year 10 months 17 days |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number | 3,720,160 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber / nbs_StockOptionsActivityAxis = nbs_UsEquityPlanMember |
Weighted average estimated fair value of shares granted | $ 9.11 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice / nbs_StockOptionsActivityAxis = nbs_UsEquityPlanMember |
Options, Vested, weighted Average Remaining Contractual Term | 6 years 7 months 13 days |

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of fully vested and expected to vest options that are exercisable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition As of the balance sheet date, the weighted-average exercise price (at which grantees can acquire the shares reserved for issuance) for exercisable stock options that are fully vested or expected to vest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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