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Accounts Receivable, Net (Tables)
 12 Months Ended
Dec. 31, 2018
Receivables [Abstract]  
Schedule of Accounts Receivable
Accounts receivable are comprised of the following (in thousands):
 
December 31,
 
2018
 
2017
Contract billings
 
$
3,094

 
$
3,751

Retainage
 
308

 
274

Subtotal
 
3,402


4,025

Less - allowance for doubtful accounts
 
(113
)
 
(185
)
Accounts receivable, net
 
$
3,289

 
$
3,840

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