Shareholders' Equity (Deficit) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		12 Months Ended			3 Months Ended
	Oct. 31, 2014	Jan. 31, 2014	Oct. 31, 2014	Oct. 31, 2013	Oct. 31, 2012	Jul. 31, 2012	Jul. 30, 2014	Jan. 23, 2014	Jun. 25, 2013	Dec. 20, 2012
Convertible Debt	$ 0		$ 0	$ 38,000					$ 38,000
Stock Issued During Period, Shares, Conversion of Convertible Securities			24,500,000
Common stock issued to settle make-whole obligation, shares			5,514,272
Stock Issued During Period, Shares, Conversion of Convertible Securities, Accrued Interest			300,000
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	14,644,352	23,000,000		4,300,000
Stock Issued During Period, Value, New Issues			105,966	5,548	64,003
Common stock issued relating to full exercise of an over allottment option								3,000,000
Price Per Share for New Common Stock Issuance							$ 2.39	$ 1.50
Common Stock, Par or Stated Value Per Share	$ 0.0001		$ 0.0001	$ 0.0001
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 3.35		$ 3.35
Proceeds from Issuance of Common Stock	35,000		105,844	5,040	64,003
Common Stock, Capital Shares Reserved for Future Issuance	18,000,000		18,000,000
Class of Warrant or Right, Unissued	1,250,000		1,250,000
number of tranches of warrants	2.0		2.0
Class of Warrant or Right, Number of Securities Called by Warrants or Rights	5,750,000		5,750,000	5,000,000
Class of Warrant or Right, Outstanding	3,750,000		3,750,000
Class of Warrant or Right, Weighted Average Strike Price of Warrants or Rights Outstanding	$ 2.08		$ 2.08
NRG Energy, Inc. [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights	2,000,000		2,000,000
Public stock offering [Member]
Proceeds from Issuance of Common Stock	32,000
Common Stock [Member]
Stock Issued During Period, Shares, New Issues			59,683,252	4,295,800	45,012,306
Stock Issued During Period, Value, New Issues			6	1	5
Common Stock [Member]
Proceeds from Issuance of Common Stock				5,600
Common Stock [Member] | Common Stock [Member]
Stock Issued During Period, Shares, New Issues			19,700,000
Proceeds from Issuance of Common Stock			41,300
POSCO Energy [Member]
Stock Issued During Period, Shares, New Issues				20,000,000
Proceeds from Issuance of Common Stock						$ 30,000
NRG Energy, Inc. [Member]
Common Stock, Capital Shares Reserved for Future Issuance	5,000,000		5,000,000