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Consolidated Statements of Operations - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Revenue:    
Revenue $ 8,755,623 $ 2,984,835
Cost of revenue:    
Cost of revenue 6,535,444 2,307,488
Gross profit 2,220,179 677,347
Operating expenses:    
Payroll and related expenses 2,992,207 2,392,587
General and administrative expenses 3,449,849 1,788,276
Marketing and business development expense 230,248 240,557
Pre-project expenses 130,707 21,286
Goodwill impairment (2,938,653)
Total 6,803,011 7,381,359
Operating loss (4,582,832) (6,704,012)
Other income (expense):    
Interest expense (9,275) (178,995)
Interest income 61,675
Other income 23,282 14,506
Loss on asset disposal (1,012) (52,039)
Total 74,670 (216,528)
Loss before income taxes (4,508,162) (6,920,540)
Income tax provision
Net loss (4,508,162) (6,920,540)
Add: net profit attributable to noncontrolling interests 184,567
Net loss attributable to common stockholders of SG Blocks, Inc. $ (4,692,729) $ (6,920,540)
Net loss per share - basic and diluted:    
Basic and diluted $ (0.79) $ (22.85)
Weighted average shares outstanding:    
Basic and diluted 5,959,403 302,844
Construction services    
Revenue:    
Revenue $ 4,104,917 $ 2,808,981
Cost of revenue:    
Cost of revenue 3,224,457 2,238,535
Engineering services    
Revenue:    
Revenue 409,206 175,854
Cost of revenue:    
Cost of revenue 322,853 68,953
Medical revenue    
Revenue:    
Revenue 4,241,500
Cost of revenue:    
Cost of revenue $ 2,988,134