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Accounts Receivable
9 Months Ended
Sep. 30, 2016
Accounts Receivable [Abstract]  
Accounts Receivable
4.Accounts Receivable

 

At September 30, 2016 and December 31, 2015, the Company’s accounts receivable consisted of the following:

 

  2016  2015 
Billed:      
SG Block sales $189,842  $82,200 
Engineering services  120,160   14,181 
Project management  4,000   14,400 
Total gross receivables  314,002   110,781 
Less: allowance for doubtful accounts  (34,235)  (24,746)
Total net receivables $279,767  $86,035