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Accounts Receivable | 12 Months Ended
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Oct. 31, 2017
Receivables [Abstract] |
Accounts Receivable | Note 3. Accounts Receivable Accounts receivable as of October 31, 2017 and 2016 consisted of the following (in thousands):
|  | 2017 |  |  | 2016 |
Advanced Technologies (including U.S. Government (1)): |  |  |  |  |  |  |  |
Amount billed |  | $ | 1,934 |  |  | $ | 2,463 |
Unbilled recoverable costs |  |  | 7,352 |  |  |  | 3,068 |
|  |  | 9,286 |  |  |  | 5,531 |
Commercial customers: |  |  |  |  |  |  |  |
Amount billed |  |  | 41,073 |  |  |  | 5,411 |
Unbilled recoverable costs |  |  | 18,162 |  |  |  | 13,651 |
|  |  | 59,235 |  |  |  | 19,062 |
|  | $ | 68,521 |  |  | $ | 24,593 |
(1) | Total U.S. government accounts receivable outstanding as of October 31, 2017 and 2016 is $3.2 million and $2.2 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 recoverable costs incurred, typically in the month subsequent to incurring costs. Some Advanced Technologies contracts are billed based on contractual milestones or costs incurred. Unbilled recoverable costs relate to revenue recognized on customer contracts that has not been billed. Accounts receivable are presented net of an allowance for doubtful accounts of $0.1 million and $0.2 million as of October 31, 2017 and 2016, respectively. 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 recoverable costs) include amounts due from POSCO Energy of $6.2 million and $5.0 million, and amounts due from NRG of $0.1 million as of each of October 31, 2017 and 2016. The Company also had amounts due to POSCO Energy of $32.7 million and $0 as of October 31, 2017 and 2016, respectively, for the purchase of inventory.

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