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Receivables and Unbilled Receivables | 12 Months Ended
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Dec. 31, 2019
Receivables [Abstract] |
Receivables and Unbilled Receivables | Receivables and Unbilled Receivables Receivables, net and unbilled receivables, net as of December 31, 2019 and 2018, respectively, were as follows (in thousands):
| 2019 |  | 2018
Receivables, net | $ | 70,630 |  |  | $ | 60,004 |
Unbilled receivables, net | 46,279 |  |  | 41,255 |
| $ | 116,909 |  |  | $ | 101,259 |
Receivables, net are recorded at face value less an allowance for doubtful accounts of approximately $396 thousand and $79 thousand as of December 31, 2019 and 2018, respectively. The unbilled receivables balance includes certain costs for work performed at risk but which we believe will be funded by the government totaling approximately $15.2 million and $4.7 million as of December 31, 2019 and 2018, respectively. We expect to invoice substantially all unbilled receivables during 2020.

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- Definition The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 + Details
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