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Accounts Receivable, Net | 9 Months Ended
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Jul. 31, 2018
Receivables [Abstract] |
Accounts Receivable, Net | Note 3. Accounts Receivable, Net Accounts receivable as of July 31, 2018 and October 31, 2017 consisted of the following:
|  | July 31, |  |  | October 31, |
|  | 2018 |  |  | 2017 |
Commercial Customers: |  |  |  |  |  |  |  |
Amount billed |  | $ | 24,196 |  |  | $ | 41,073 |
Unbilled receivables (1) |  |  | 9,512 |  |  |  | 18,162 |
|  |  | 33,708 |  |  |  | 59,235 |
Advanced Technologies (including U.S. government(2)): |  |  |  |  |  |  |  |
Amount billed |  |  | 1,208 |  |  |  | 1,934 |
Unbilled receivables |  |  | 4,514 |  |  |  | 7,352 |
|  |  | 5,722 |  |  |  | 9,286 |
Accounts receivable, net |  | $ | 39,430 |  |  | $ | 68,521 |
(1) | Additional long-term unbilled receivables of $8.9 million and $12.8 million are included within “Other Assets” as of July 31, 2018 and October 31, 2017, respectively.
(2) | Total U.S. government accounts receivable, including unbilled receivables, outstanding as of July 31, 2018 and October 31, 2017 were $2.6 million and $3.2 million, respectively.
We bill customers for power plant and power plant 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 receivables incurred, typically in the month subsequent to incurring costs. 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. Accounts receivable are presented net of an allowance for doubtful accounts of $0.1 million as of July 31, 2018 and October 31, 2017. 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. Accounts receivable from commercial customers (including unbilled receivables) included amounts due from POSCO Energy of $12.4 million and $6.2 million as of July 31, 2018 and October 31, 2017, respectively, and amounts due from NRG and NRG Yield of $2.0 million and $0.1 million as of July 31, 2018 and October 31, 2017, respectively.

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