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Segment Information - Revenues by Geographic Location (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 31, 2017 | Jul. 31, 2017 | Apr. 30, 2017 | Jan. 31, 2017 | Oct. 31, 2016 | Jul. 31, 2016 | Apr. 30, 2016 | Jan. 31, 2016 | Oct. 31, 2017 | Oct. 31, 2016 | Oct. 31, 2015
schedule of revenues by geographic area [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 47,889 | $ 10,358 | $ 20,417 | $ 17,002 | $ 24,473 | $ 21,716 | $ 28,581 | $ 33,482 | $ 95,666 | $ 108,252 | $ 163,077
UNITED STATES |  |  |  |  |  |  |  |  |  |  |
schedule of revenues by geographic area [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 47,539 | 48,697 | 52,109
SOUTH KOREA |  |  |  |  |  |  |  |  |  |  |
schedule of revenues by geographic area [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 44,217 | 52,007 | 109,953
ENGLAND |  |  |  |  |  |  |  |  |  |  |
schedule of revenues by geographic area [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 368 | 277 | 142
GERMANY |  |  |  |  |  |  |  |  |  |  |
schedule of revenues by geographic area [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 2,740 | 7,147 | 764
CANADA |  |  |  |  |  |  |  |  |  |  |
schedule of revenues by geographic area [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 729 | $ 124 |
SPAIN |  |  |  |  |  |  |  |  |  |  |
schedule of revenues by geographic area [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 73 |  | $ 109

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- Definition [Line Items] for schedule of revenues by geographic area [Table] + References No definition available. + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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