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Net Income (Loss) Per Share (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Net Income (Loss) Per Share [Abstract]        
Net (loss) attributable to SG Blocks $ (1,232,904) $ (1,705,672) $ (1,987,005) $ (2,396,002)
Net loss per share - basic and diluted:        
Basic and diluted $ (0.29) $ (3.15) $ (0.47) $ (6.75)
Weighted average shares outstanding:        
Basic and diluted 4,260,041 541,424 4,260,041 354,703