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Income Taxes (Details 1)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Summary of reconciliation of the federal statutory rate
Benefit for income taxes at federal statutory rate	34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State and local income taxes, net of federal benefit	8.20%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	9.60%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Differences attributable to change in state business apportionment	(6.20%)sgbx_DifferencesAttributableToChangeInStateBusinessApportionment	(1.90%)sgbx_DifferencesAttributableToChangeInStateBusinessApportionment
Change in fair value of derivative liabilities	19.30%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	7.30%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate
Loss on extinguishment of debt	(28.20%)sgbx_LossOnExtinguishmentOfDebt
True up	5.80%sgbx_TrueUp	1.80%sgbx_TrueUp
Other	(0.50%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments	(0.50%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Less valuation allowance	(32.40%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	(50.30%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Effective income tax rate	0.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations	0.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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