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Stock Options and Grants (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Summary of stock option activity and changes    
Number of Warrants, Beginning balance 10,330,001us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 9,317,501us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Granted, Shares 5,207,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross 1,012,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Exercised, Shares (112,500)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised  
Cancelled, Shares      
Number of Warrants, Ending balance 15,425,001us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 10,330,001us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Exercisable, Shares 11,625,835us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber 8,416,668us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
Outstanding, Weighted Average Fair Value Per Share $ 0.10sgbx_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageFairValue $ 0.11sgbx_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageFairValue
Granted, Weighted Average Fair Value Per Share $ 0.11us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 0.09us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Exercised, Weighted Average Fair Value $ 0.09sgbx_ShareBasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisedInPeriodWeightedAverageFairValue   
Cancelled, Weighted Average Fair Value Per Share      
Outstanding, Weighted Average Fair Value $ 0.07sgbx_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageFairValue $ 0.10sgbx_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageFairValue
Exercisable, Weighted Average Fair Value $ 0.09sgbx_ShareBasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageFairValue $ 0.10sgbx_ShareBasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageFairValue
Weighted Average Exercise Price Per Share, Beginning balance $ 0.36us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice $ 0.36us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Granted, Weighted Average Exercise Price Per Share $ 0.14us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice $ 0.41us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
Exercises, Weighted Average Exercise Price Per Share $ 0.20us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice  
Cancelled, Weighted Average Exercise Price Per Share     
Weighted Average Exercise Price Per Share, Ending balance $ 0.30us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice $ 0.36us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Exercisable, Weighted Average Exercise Price Per Share $ 0.33us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice $ 0.32us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
Outstanding, Weighted Average Remaining Term (in years) 8 years 9 years 11 days
Exercisable, Weighted Average Remaining Term 7 years 18 days 8 years 18 days
Aggregate Intrinsic Value, Beginning Balance $ 109,050us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue $ 539,650us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
Aggregate Intrinsic Value, Ending Balance 112,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue 109,050us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
Exercisable, Aggregate Intrinsic Value $ 37,500us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1 $ 107,517us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1