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Convertible Debentures (Details) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Total debt $ 3,304,110us-gaap_LongTermDebt $ 3,202,902us-gaap_LongTermDebt
Less current portion 3,304,110us-gaap_LongTermDebtCurrent 800,726us-gaap_LongTermDebtCurrent
Long-term debt    2,402,176us-gaap_LongTermDebtNoncurrent
2014 Exchange Debentures [Member]    
Debt Instrument [Line Items]    
Total debt 1,915,200us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= sgbx_ConvertibleDebentureThreeMember
1,915,200us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= sgbx_ConvertibleDebentureThreeMember
2014 New Debentures [Member]    
Debt Instrument [Line Items]    
Total debt $ 1,388,910us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= sgbx_ConvertibleDebentureFourMember
$ 1,287,702us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= sgbx_ConvertibleDebentureFourMember