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Accounts Receivable, Net and Unbilled Receivables | 6 Months Ended
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Apr. 30, 2021
Receivables [Abstract] |
Accounts Receivable, Net and Unbilled Receivables | Note 4. Accounts Receivable, Net and Unbilled Receivables Accounts receivable, net and Unbilled receivables as of April 30, 2021 and October 31, 2020 consisted of the following (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | April 30, | ​ | October 31,
​ |  | 2021 |  | 2020
Commercial Customers: | ​ | ​ | ​ | ​ | ​ | ​
Amount billed | ​ | $ | 10,183 | ​ | $ | 7,329
Unbilled receivables (1) | ​ | ​ | 6,289 | ​ | ​ | 7,063
​ | ​ | ​ | 16,472 | ​ | ​ | 14,392
Advanced Technologies (including U.S. government(2)): | ​ | ​ | ​ | ​ | ​ | ​
Amount billed | ​ | ​ | 1,964 | ​ | ​ | 2,234
Unbilled receivables | ​ | ​ | 1,371 | ​ | ​ | 978
​ | ​ | ​ | 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.
We bill customers for power platform and power platform component sales based on certain contractual milestones being reached. We bill service agreements based on the contract price and billing terms of the contracts. Generally, our Advanced Technologies contracts are billed based on actual revenues recorded, typically in the subsequent month. Some Advanced Technologies contracts are billed based on contractual milestones or costs incurred. Unbilled receivables relate to revenue recognized on customer contracts that have not been billed. The Company had no allowance for doubtful accounts as of April 30, 2021 and October 31, 2020. 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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