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Accounts Receivable (Details) - USD ($) $ in Thousands | Jan. 31, 2017 | Oct. 31, 2016
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Contract Receivable |  | $ 6,928 | $ 5,411
Unbilled Contracts Receivable | [1] | 11,596 | 13,651
Commercial Customers accounts receivable |  | 18,524 | 19,062
Government Contract Receivable |  | 2,427 | 2,463
Government Contract Receivable, Unbilled Amounts |  | 4,668 | 3,068
U.S. Government accounts receivable total | [2] | 7,095 | 5,531
Accounts Receivable, Net, Current |  | 25,619 | 24,593
Allowance for Doubtful Accounts Receivable, Current |  | 200 |
Long-term Investments and Receivables, Net | [3] | 7,000 | 5,700
POSCO Energy [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Accounts Receivable, Related Parties, Current |  | 4,300 | 5,000
NRG Energy, Inc. [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Accounts Receivable, Related Parties, Current |  |  | 100
Government [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
U.S. Government accounts receivable total |  | $ 2,000 | $ 2,200
[1] | 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.
[2] | 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.
[3] | Represents unbilled recoverable costs that relate to revenue recognized on customer contracts that will be billed in future periods in excess of twelve months from January 31, 2017.

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