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ACCOUNTS RECEIVABLE, NET
 3 Months Ended
Mar. 31, 2019
Receivables [Abstract]  
ACCOUNTS RECEIVABLE, NET
ACCOUNTS RECEIVABLE, NET
 
Accounts receivable consists of the following (unaudited)(in thousands):
 
 
 
March 31, 2019
 
December 31, 2018
Contract billings
 
$
2,966

 
$
3,094

Retainage
 
—

 
308

Subtotal
 
2,966

 
3,402

Less – allowance for doubtful accounts
 
(312
)
 
(113
)
Accounts receivable, net
 
$
2,654

 
$
3,289