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Accounts Receivable, Net and Unbilled Receivables - Schedule of Accounts Receivable, Net and Unbilled Receivables (Details) - USD ($) $ in Thousands | Apr. 30, 2021 | Oct. 31, 2020
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Receivables [Abstract] |  |  |
Amount billed |  | $ 10,183 | $ 7,329
Unbilled receivables | [1] | 6,289 | 7,063
Commercial customers accounts receivable |  | 16,472 | 14,392
Advanced Technologies including U.S. government, Amount billed | [2] | 1,964 | 2,234
Advanced Technologies including U.S. government, Unbilled receivables | [2] | 1,371 | 978
Advanced Technologies including U.S. government, Accounts receivable | [2] | 3,335 | 3,212
Accounts receivable, net and unbilled receivables |  | $ 19,807 | $ 17,604
[1] | Additional long-term unbilled receivables of $9.9 million and $8.9 million are included within “Other Assets” as of April 30, 2021 and October 31, 2020, respectively.
[2] | Total U.S. government accounts receivable, including unbilled receivables, outstanding as of April 30, 2021 and October 31, 2020 were $1.0 million and $1.1 million, respectively.

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- Definition Unbilled amounts due for services rendered or to be rendered, actions taken or to be taken, or a promise to refrain from taking certain actions in accordance with the terms of a legally binding agreement between the entity and, at a minimum, one other party. An example would be amounts associated with contracts or programs where the recognized revenue for performance thereunder exceeds the amounts billed under the terms thereof as of the date of the balance sheet. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 912 -SubTopic 310 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118261985&loc=d3e55302-109406 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3(c)(3)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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