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Nature of Business and Basis of Presentation (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jul. 31, 2013 | Jul. 31, 2012 | Jul. 31, 2013 | Jul. 31, 2012 | Oct. 31, 2012
Restricted cash and cash equivalents - short term | $ 5,053 |  | $ 5,053 |  | $ 5,335
Restricted cash and cash equivalents - long-term | $ 4,950 |  | $ 4,950 |  | $ 5,300
significant customer revenue percentage | 89.00% | 81.00% | 90.00% | 79.00% |
Dominion Bridgeport FuelCell Park [Member] |  |  |  |  |
significant customer revenue percentage | 51.00% | 0.00% | 32.00% | 0.00% |
POSCO Energy [Member] |  |  |  |  |
Common stock ownership percentage | 16.00% |  | 16.00% |  |
significant customer revenue percentage | 34.00% | 72.00% | 53.00% | 72.00% |
U.S. Government [Member] |  |  |  |  |
significant customer revenue percentage | 4.00% | 9.00% | 5.00% | 7.00% |

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- Definition Percent of consolidated revenue by customer. + References No definition available. + Details
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- Definition The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. For a classified balance sheet represents the current portion only (the noncurrent portion has a separate concept); there is a separate and distinct element for unclassified presentations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Cash and equivalents whose use in whole or in part is restricted for the long-term, generally by contractual agreements or regulatory requirements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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