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Accounts Receivable, Net and Unbilled Receivables | 9 Months Ended
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Jul. 31, 2019
Receivables [Abstract] |
Accounts Receivable, Net and Unbilled Receivables | Note 6. Accounts Receivable, Net and Unbilled Receivables Accounts receivable, net and Unbilled receivables as of July 31, 2019 and October 31, 2018 consisted of the following:
|  | July 31, |  |  | October 31, |
|  | 2019 |  |  | 2018 |
Commercial Customers: |  |  |  |  |  |  |  |
Amount billed |  | $ | 2,016 |  |  | $ | 7,415 |
Unbilled receivables (1) |  |  | 6,217 |  |  |  | 10,632 |
|  |  | 8,233 |  |  |  | 18,047 |
Advanced Technologies (including U.S. government(2)): |  |  |  |  |  |  |  |
Amount billed |  |  | 1,689 |  |  |  | 1,865 |
Unbilled receivables |  |  | 1,969 |  |  |  | 3,127 |
|  |  | 3,658 |  |  |  | 4,992 |
Accounts receivable, net and unbilled receivables |  | $ | 11,891 |  |  | $ | 23,039 |
(1) | Additional long-term unbilled receivables of $4.2 million and $9.4 million are included within “Other Assets” as of July 31, 2019 and October 31, 2018, respectively. The balance decreased because amounts previously recorded in connection with the Bridgeport Fuel Cell Project service agreement were settled in connection with the acquisition of the Bridgeport Fuel Cell Project.
(2) | Total U.S. government accounts receivable, including unbilled receivables, outstanding as of July 31, 2019 and October 31, 2018 were $1.0 million and $2.3 million, respectively.
Accounts receivable are presented net of an allowance for doubtful accounts of $0.2 million as of October 31, 2018. There was no allowance for doubtful accounts as of July 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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