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Construction Backlog (Details Textual) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2018 USD ($) Number | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) Number
Construction Backlog (Textual) |  |  |
Construction backlog contract amount | $ | $ 27 | $ 15 | $ 55
Number of large contracts | Number | 1 |  | 2

X
- Definition Its represented contract revenue earned during the period. + References No definition available. + Details
Name: | sgbx_ConstructionBacklogContractRevenue
Namespace Prefix: | sgbx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | sgbx_ConstructionBacklogTextualAbstract
Namespace Prefix: | sgbx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Its represented number of large contracts. + References No definition available. + Details
Name: | sgbx_NumberOfLargeContracts
Namespace Prefix: | sgbx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration