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Convertible Debentures (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Total debt $ 3,202,902us-gaap_LongTermDebt $ 1,802,612us-gaap_LongTermDebt
Less current portion 800,726us-gaap_LongTermDebtCurrent 1,802,612us-gaap_LongTermDebtCurrent
Long-term debt 2,402,176us-gaap_LongTermDebtNoncurrent   
2012 Hillair Debentures [Member]    
Debt Instrument [Line Items]    
Total debt    975,231us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= sgbx_HillairCapitalInvestmentsLpMember
January 2013 Debentures [Member]    
Debt Instrument [Line Items]    
Total debt    346,581us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= sgbx_ConvertibleDebentureOneMember
April 2013 Debentures [Member]    
Debt Instrument [Line Items]    
Total debt    480,800us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= sgbx_ConvertibleDebentureTwoMember
2014 Exchange Debentures [Member]    
Debt Instrument [Line Items]    
Total debt 1,915,200us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= sgbx_ConvertibleDebentureThreeMember
  
2014 New Debentures [Member]    
Debt Instrument [Line Items]    
Total debt $ 1,287,702us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= sgbx_ConvertibleDebentureFourMember