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Shareholders' Equity (Deficit) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Oct. 31, 2016 | Oct. 31, 2015 | Oct. 31, 2014 | Jul. 12, 2016
Common Stock, Shares Authorized | 75,000,000 | 39,583,333 |  |
Stock Issued During Period, Value, New Issues | $ 36,056 | $ 26,921 | $ 105,966 |
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs | $ 2,600 |  |  |
Common Stock, Par or Stated Value Per Share | $ 0.0001 | $ 0.0001 |  |
Common stock ownership percentage | 4.99% |  |  |
Proceeds from Issuance of Common Stock | $ 70,929 | $ 27,060 | $ 105,844 |
Common Stock, Capital Shares Reserved for Future Issuance | 2,500,000 |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | 14,331,463 | 1,666,461 |  |
Common Stock [Member] |  |  |  |
Common stock issued to settle make-whole obligation, shares |  |  | 459,523 |
Stock Issued During Period, Shares, New Issues | 6,023,372 | 1,845,166 | 4,973,604 |
Stock Issued During Period, Value, New Issues | $ 1 | $ 1 | $ 0 |
Common Stock [Member] | Common Stock [Member] |  |  |  |
Stock Issued During Period, Shares, New Issues | 6,000,000 | 1,900,000 |  |
Proceeds from Issuance of Common Stock | $ 36,100 | $ 26,900 |  |
POSCO Energy [Member] |  |  |  |
Common stock ownership percentage | 7.00% |  |  |
NRG Energy [Member] |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ 40.20 |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | 200,000 |  |  |
Series A Warrant [Member] |  |  |  |
Warrants expired | 0 |  |  |
Class of Warrant or Right, Outstanding | 7,680,000 |  |  | 7,680,000
Common stock issued during period, warrants exercised | 0 |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ 5.83 |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | 7,680,000 | 0 |  |
Series B Warrant [Member] |  |  |  |
Warrants expired | 0 |  |  |
Class of Warrant or Right, Outstanding | 3,826,000 |  |  | 4,926,000
Common stock issued during period, warrants exercised | (1,100,000) |  |  |
Common stock issued after period, warrants exercised | 1,800,000 |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ 0.0001 |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | 3,826,000 | 0 |  |
NRG Energy, Inc. [Member] |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | 166,666 | 166,666 |  |
Common Stock and Pre-Funded Warrants [Member] |  |  |  |
Stock Issued During Period, Shares, New Issues | 1,474,000 |  |  |
Stock Issued During Period, Value, New Issues | $ 34,700 |  |  |

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