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Accounts Receivable
9 Months Ended
Sep. 30, 2015
Accounts Receivable [Abstract]  
Accounts Receivable
4.Accounts Receivable

 

At September 30, 2015 and December 31, 2014, the Company’s accounts receivable consisted of the following:

 

  2015  2014 
Billed:      
SG Block sales $163,331  $172,837 
Engineering services  11,930   2,000 
Project management  16,310   15,842 
Total gross receivables  191,571   190,679 
Less: allowance for doubtful accounts  (24,746)  (24,746)
Total net receivables $166,825  $165,933