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Accounts Receivable
 3 Months Ended
Jan. 31, 2014
Receivables [Abstract]  
Accounts Receivable
Accounts Receivable
Accounts receivable at January 31, 2014 and October 31, 2013 consisted of the following:
 
 
January 31, 2014
 
October 31, 2013
Advanced Technology (including U.S. Government(1)):
 
 
 
Amount billed
$
1,962

 
$
786

Unbilled recoverable costs
1,355

 
639

 
3,317

 
1,425

Commercial Customers:
 
 
 
Amount billed
15,286

 
17,344

Unbilled recoverable costs
15,228

 
30,347

 
30,514

 
47,691

       Accounts receivable, net
$
33,831

 
$
49,116


(1)
Total U.S. Government accounts receivable outstanding at January 31, 2014 is $1.4 million .

We bill customers for power plant and module kit sales based on certain milestones being reached. We bill SA's based on the contract price and billing terms of the contracts. The majority of advanced technology contracts are with the U.S. Government. We bill the U.S. Government based on actual recoverable costs incurred, typically in the month subsequent to incurring costs. The remainder of advanced technology contracts are billed based on milestones or costs incurred. Unbilled recoverable costs relate to revenue recognized on customer contracts that have not been billed. Unbilled amounts at January 31, 2014 and October 31, 2013 included $0.3 million and $17.8 million due from Dominion under the Bridgeport fuel cell park project and $8.6 million and $6.7 million due from POSCO Energy. Accounts receivable are presented net of an allowance for doubtful accounts of $0.07 million and $0.01 million at January 31, 2014 and October 31, 2013, respectively.

Commercial Customers accounts receivable (including Unbilled recoverable costs) include amounts due from POSCO Energy of $20.3 million and $17.4 million at January 31, 2014 and October 31, 2013, respectively.