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Accounts Receivable
 9 Months Ended
Jul. 31, 2016
Receivables [Abstract]  
Accounts Receivable
Accounts Receivable
Accounts receivable as of July 31, 2016 and October 31, 2015 consisted of the following:
 
 
July 31, 2016
 
October 31, 2015
Commercial Customers:
 
 
 
Amount billed
$
9,344

 
$
19,331

Unbilled recoverable costs (2)
15,201

 
37,949

 
24,545

 
57,280

Advanced Technology (including U.S. Government(1)):
 
 
 
Amount billed
639

 
433

Unbilled recoverable costs
4,106

 
3,077

 
4,745

 
3,510

       Accounts receivable, net
$
29,290

 
$
60,790


(1)
Total U.S. Government accounts receivable outstanding as of July 31, 2016 and October 31, 2015 were $3.3 million and $2.6 million, respectively.
(2)
Unbilled recoverable costs of $4.8 million is included within long-term Other Assets as of July 31, 2016.

We bill customers for power plant and module kit 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 and $0.5 million as of July 31, 2016 and October 31, 2015, respectively.

Commercial Customers accounts receivable (including Unbilled recoverable costs) included amounts due from POSCO Energy of $8.7 million and $34.4 million as of July 31, 2016 and October 31, 2015, respectively and amounts due from NRG and NRG Yield of $0.02 million as of October 31, 2015. There were no amounts outstanding from NRG and NRG Yield as of July 31, 2016.