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Accounts Receivable, Net (Tables)
 12 Months Ended
Dec. 31, 2017
Receivables [Abstract]  
Schedule of Accounts Receivable
Accounts receivable are comprised of the following (in thousands):
 
December 31,
 
2017
 
2016
Contract billings
 
$
3,751

 
$
2,330

Retainage
 
274

 
370

Subtotal
 
4,025


2,700

Less - allowance for doubtful accounts
 
(185
)
 
(96
)
Accounts receivable, net
 
$
3,840

 
$
2,604

 
Retainage balances are expected to be collected within the next twelve months.