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Accounts Receivable
 3 Months Ended
Jan. 31, 2017
Receivables [Abstract]  
Accounts Receivable
Accounts Receivable
Accounts receivable as of January 31, 2017 and October 31, 2016 consisted of the following:
 
 
January 31, 2017
 
October 31, 2016
Commercial Customers:
 
 
 
Amount billed
$
6,928

 
$
5,411

Unbilled recoverable costs (2)
11,596

 
13,651

 
18,524

 
19,062

Advanced Technology (including U.S. Government(1)):
 
 
 
Amount billed
2,427

 
2,463

Unbilled recoverable costs
4,668

 
3,068

 
7,095

 
5,531

       Accounts receivable, net
$
25,619

 
$
24,593


(1)
Total U.S. Government accounts receivable outstanding as of January 31, 2017 and October 31, 2016 were $2.0 million and $2.2 million, respectively.
(2)
Additional unbilled recoverable costs of $7.0 million and $5.7 million are included within long-term Other Assets as of January 31, 2017 and October 31, 2016, respectively.

We bill customers for power plant 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 technology contracts are billed based on actual recoverable costs incurred, typically in the month subsequent to incurring costs. Some advanced technology contracts are billed based on contractual milestones or costs incurred. Unbilled recoverable costs relate to revenue recognized on customer contracts that have not been billed. Accounts receivable are presented net of an allowance for doubtful accounts of $0.2 million as of January 31, 2017 and October 31, 2016. 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) included amounts due from POSCO Energy of $4.3 million and $5.0 million as of January 31, 2017 and October 31, 2016, respectively and amounts due from NRG and NRG Yield of $0.1 million as of October 31, 2016. There were no amounts outstanding from NRG and NRG Yield as of January 31, 2017.