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Accounts Receivable
6 Months Ended
Jun. 30, 2016
Accounts Receivable [Abstract]  
Accounts Receivable
4. Accounts Receivable

 

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

 

    2016     2015  
Billed:            
SG Block sales   $ 180,610     $ 82,200  
Engineering services     40,518       14,181  
Project management     4,000       14,400  
Total gross receivables     225,128       110,781  
Less: allowance for doubtful accounts     (34,235 )     (24,746 )
Total net receivables   $ 190,893     $ 86,035