Annual report pursuant to Section 13 and 15(d)

Receivables, net

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Receivables, net
12 Months Ended
Dec. 31, 2017
Receivables [Abstract]  
Receivables, net
Receivables, net

Total receivables, net of allowance for doubtful accounts of approximately $83 thousand and $30 thousand as of December 31, 2017 and 2016, respectively, were as follows (in thousands):
 
2017
 
2016
Billed
$
55,760

 
$
55,669

Unbilled
42,577

 
45,549

Total receivables
$
98,337

 
$
101,218



The unbilled balance includes certain costs for work performed at risk but which we believe will be funded by the government totaling approximately $4.0 million and $2.1 million as of December 31, 2017 and 2016, respectively. We expect to invoice substantially all unbilled receivables during 2018.