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Stockholders' Equity (Details 2) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Stockholders Equity [Line Items]    
Number of Options Outstanding 18,986,395us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions  
Weighted-Average Exercise Price $ 1.89us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice $ 1.79us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Weighted-Average Remaining Contractual Life (in Years) 5 years 1 month 6 days  
Aggregate Intrinsic Value $ 20,306,807us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue $ 24,000,710us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
Range One [Member]    
Stockholders Equity [Line Items]    
Range of Exercise Price (Lower) $ 0.5us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_RangeAxis
= cur_RangeOneMember		  
Range of Exercise Price (Upper) $ 1.00us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_RangeAxis
= cur_RangeOneMember		  
Number of Options Outstanding 7,000,000us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_RangeAxis
= cur_RangeOneMember		  
Weighted-Average Exercise Price $ 0.80us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_RangeAxis
= cur_RangeOneMember		  
Weighted-Average Remaining Contractual Life (in Years) 5 years 7 months 6 days  
Aggregate Intrinsic Value 13,440,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_RangeAxis
= cur_RangeOneMember		  
Range Two [Member]    
Stockholders Equity [Line Items]    
Range of Exercise Price (Lower) $ 1.01us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_RangeAxis
= cur_RangeTwoMember		  
Range of Exercise Price (Upper) $ 2.00us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_RangeAxis
= cur_RangeTwoMember		  
Number of Options Outstanding 4,171,336us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_RangeAxis
= cur_RangeTwoMember		  
Weighted-Average Exercise Price $ 1.19us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_RangeAxis
= cur_RangeTwoMember		  
Weighted-Average Remaining Contractual Life (in Years) 6 years 8 months 12 days  
Aggregate Intrinsic Value 6,377,415us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_RangeAxis
= cur_RangeTwoMember		  
Range Three [Member]    
Stockholders Equity [Line Items]    
Range of Exercise Price (Lower) $ 2.01us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_RangeAxis
= cur_RangeThreeMember		  
Range of Exercise Price (Upper) $ 3.00us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_RangeAxis
= cur_RangeThreeMember		  
Number of Options Outstanding 2,168,333us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_RangeAxis
= cur_RangeThreeMember		  
Weighted-Average Exercise Price $ 2.49us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_RangeAxis
= cur_RangeThreeMember		  
Weighted-Average Remaining Contractual Life (in Years) 4 years 8 months 12 days  
Aggregate Intrinsic Value 489,392us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_RangeAxis
= cur_RangeThreeMember		  
Range Four [Member]    
Stockholders Equity [Line Items]    
Range of Exercise Price (Lower) $ 3.01us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_RangeAxis
= cur_RangeFourMember		  
Range of Exercise Price (Upper) $ 5.00us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_RangeAxis
= cur_RangeFourMember		  
Number of Options Outstanding 5,646,726us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_RangeAxis
= cur_RangeFourMember		  
Weighted-Average Exercise Price $ 3.54us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_RangeAxis
= cur_RangeFourMember		  
Weighted-Average Remaining Contractual Life (in Years) 3 years 7 months 6 days  
Aggregate Intrinsic Value $ 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_RangeAxis
= cur_RangeFourMember