Accounts Receivable
 3 Months Ended
Jan. 31, 2016
Receivables [Abstract]  
Accounts Receivable
Accounts Receivable
Accounts receivable as of January 31, 2016 and October 31, 2015 consisted of the following:
 
 
January 31, 2016
 
October 31, 2015
Commercial Customers:
 
 
 
Amount billed
$
10,753

 
$
19,331

Unbilled recoverable costs
30,651

 
37,949

 
41,404

 
57,280

Advanced Technology (including U.S. Government(1)):
 
 
 
Amount billed
643

 
433

Unbilled recoverable costs
3,349

 
3,077

 
3,992

 
3,510

       Accounts receivable, net
$
45,396

 
$
60,790


(1)
Total U.S. Government accounts receivable outstanding as of January 31, 2016 and October 31, 2015 was $2.9 million and $2.6 million, respectively.

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 $0.5 million as of January 31, 2016 and October 31, 2015.

Commercial Customers accounts receivable (including Unbilled recoverable costs) included amounts due from POSCO Energy of $13.9 million and $34.4 million as of January 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 January 31, 2016.