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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 | $ 1,494 sgbx_WarrantyClaimsOnContracts | $ 1,275 sgbx_WarrantyClaimsOnContracts |
Inventory work-in-process | $ 561,826 us-gaap_InventoryWorkInProcess |  | 198,970 us-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 | 4 sgbx_NumberOfCustomers / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember |  | 2 sgbx_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 | 2 sgbx_NumberOfCustomers / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueGoodsNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember | 2 sgbx_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 | 1 sgbx_NumberOfCustomers / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_CostOfGoodsTotalMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_SupplierConcentrationRiskMember | 1 sgbx_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 |  | 1 sgbx_NumberOfCustomers / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_CostOfGoodsTotalMember / us-gaap_ConcentrationRiskByTypeAxis = sgbx_SupplierConcentrationRiskOneMember |

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