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Summary of Significant Accounting Policies (Details Textual) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014 Customer
Summary of significant accounting policies (Textual)
Term of company's operating cycle	The length of the Company's contracts varies, but is typically between six to twelve months.
Dividend yield	0.00%us-gaap_FairValueAssumptionsExpectedDividendRate
Warranty offered on completed contracts by Company	1 year
Warranty claims on contracts	$ 1,494sgbx_WarrantyClaimsOnContracts	$ 1,275sgbx_WarrantyClaimsOnContracts
Inventory work-in-process	$ 561,826us-gaap_InventoryWorkInProcess		198,970us-gaap_InventoryWorkInProcess
Accounts Receivable [Member] | Customer Concentration Risk [Member]
Summary of significant accounting policies (Textual)
Concentration risk, percentage	93.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember		85.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember
Number of customers	4sgbx_NumberOfCustomers / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember		2sgbx_NumberOfCustomers / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember
Total revenue [Member] | Customer Concentration Risk [Member]
Summary of significant accounting policies (Textual)
Number of customers	2sgbx_NumberOfCustomers / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueGoodsNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember	2sgbx_NumberOfCustomers / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueGoodsNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember
Total revenue [Member] | Customer One [Member] | Customer Concentration Risk [Member]
Summary of significant accounting policies (Textual)
Concentration risk, percentage	44.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueGoodsNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = sgbx_CustomerMember	22.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueGoodsNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = sgbx_CustomerMember
Total revenue [Member] | Customer Two [Member] | Customer Concentration Risk [Member]
Summary of significant accounting policies (Textual)
Concentration risk, percentage	40.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueGoodsNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = sgbx_CustomerOneMember	66.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueGoodsNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = sgbx_CustomerOneMember
Total cost of revenue [Member] | Vendor Concentration Risk- Related Party [Member]
Summary of significant accounting policies (Textual)
Concentration risk, percentage	57.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_CostOfGoodsTotalMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_SupplierConcentrationRiskMember	23.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_CostOfGoodsTotalMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_SupplierConcentrationRiskMember
Number of customers	1sgbx_NumberOfCustomers / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_CostOfGoodsTotalMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_SupplierConcentrationRiskMember	1sgbx_NumberOfCustomers / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_CostOfGoodsTotalMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_SupplierConcentrationRiskMember
Total cost of revenue [Member] | Vendor Concentration Risk - Unrelated Party [Member]
Summary of significant accounting policies (Textual)
Concentration risk, percentage		67.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_CostOfGoodsTotalMember / us-gaap_ConcentrationRiskByTypeAxis = sgbx_SupplierConcentrationRiskOneMember
Number of customers		1sgbx_NumberOfCustomers / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_CostOfGoodsTotalMember / us-gaap_ConcentrationRiskByTypeAxis = sgbx_SupplierConcentrationRiskOneMember

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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