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Accounts Receivable, Net and Unbilled Receivables | 3 Months Ended
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Jan. 31, 2020
Receivables [Abstract] |
Accounts Receivable, Net and Unbilled Receivables | Note 4. Accounts Receivable, Net and Unbilled Receivables Accounts receivable, net and Unbilled receivables as of January 31, 2020 and October 31, 2019 consisted of the following:
|  | January 31, |  |  | October 31, |
|  | 2020 |  |  | 2019 |
Commercial Customers: |  |  |  |  |  |  |  |
Amount billed |  | $ | 3,790 |  |  | $ | 2,227 |
Unbilled receivables (1) |  |  | 5,770 |  |  |  | 6,139 |
|  |  | 9,560 |  |  |  | 8,366 |
Advanced Technologies (including U.S. government(2)): |  |  |  |  |  |  |  |
Amount billed |  |  | 1,803 |  |  |  | 1,065 |
Unbilled receivables |  |  | 1,753 |  |  |  | 1,545 |
|  |  | 3,556 |  |  |  | 2,610 |
Accounts receivable, net and unbilled receivables |  | $ | 13,116 |  |  | $ | 10,976 |
(1) | Additional long-term unbilled receivables of $3.2 million and $3.6 million are included within “Other Assets” as of January 31, 2020 and October 31, 2019, respectively.
(2) | Total U.S. government accounts receivable, including unbilled receivables, outstanding as of January 31, 2020 and October 31, 2019 were $2.0 million and $1.2 million, respectively.
Accounts receivable are presented net of an allowance for doubtful accounts. There was no allowance for doubtful accounts as of January 31, 2020 and October 31, 2019. Uncollectible accounts receivable are charged against the allowance for doubtful accounts when all collection efforts have failed and it is deemed unlikely that the amount will be recovered.

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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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