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Accounts Receivable and Contract Assets, Net | 9 Months Ended
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Sep. 25, 2020
Receivables Net Current [Abstract] |
Accounts Receivable and Contract Assets, Net | 3. Accounts Receivable and Contract Assets, Net Accounts receivable and contract assets, net, consisted of the following (in thousands):
|  | September 25, |  |  | December 27, |
|  | 2020 |  |  | 2019 |
Accounts receivable |  | $ | 26,167 |  |  | $ | 35,884 |
Contract assets (unbilled revenue) |  |  | 11,317 |  |  |  | 14,637 |
Allowance for doubtful accounts |  |  | (1,263 | ) |  |  | (743 | )
Accounts receivable and contract assets, net |  | $ | 36,221 |  |  | $ | 49,778 |
Accounts receivable is net of uncollected advanced billings. Contract assets represent revenue for services performed that have not been invoiced.

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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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