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Shareholders' Equity (Deficit) (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended |  |  |  | 12 Months Ended | 3 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 30, 2012 | Oct. 31, 2013 | Oct. 31, 2012 | Oct. 31, 2011 | Dec. 20, 2012 | Mar. 27, 2012 | Jan. 31, 2011 | Oct. 31, 2013 Common Stock [Member] | Oct. 31, 2012 Common Stock [Member] | Oct. 31, 2011 Common Stock [Member] | Oct. 31, 2012 Common Stock [Member] | Oct. 31, 2013 Common Stock [Member] | Jan. 31, 2013 POSCO Energy [Member] | Apr. 30, 2012 POSCO Energy [Member] | Oct. 31, 2013 NRG Energy [Member]
Stock Issued During Period, Shares, Acquisitions |  | 3,526,764 |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  |  |  |  | 61.00% |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues | 23,000,000 | 4,295,800 | 2,012,506 |  |  |  |  | 4,295,800 | 45,012,306 | 24,064,924 |  |  | 20,000,000 |  |
Stock Issued During Period, Value, New Issues |  | $ 5,548 | $ 64,003 | $ 32,864 |  |  |  | $ 1 | $ 5 | $ 2 |  |  |  |  |
Common stock issued relating to full exercise of an over allottment option |  |  |  |  |  | 3,000,000 |  |  |  |  |  |  |  |  |
Price Per Share for New Common Stock Issuance | $ 1.50 |  |  |  |  | $ 1.50 |  |  |  |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share |  | $ 0.0001 | $ 0.0001 |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  | 2.29 |  |  |  |  |  |  |  |  |  |  |  |  | 2.18
Proceeds from Issuance of Common Stock | $ 32,000 | $ 5,040 | $ 64,003 | $ 32,930 |  |  |  |  |  |  | $ 2,000 | $ 5,600 |  | $ 30,000 |
Common Stock, Capital Shares Reserved for Future Issuance |  | 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  | 5,000,000
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  | 5,000,000 |  |  |  |  | 10,200,000 |  |  |  |  |  |  |  | 5,000,000

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