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Segment Information - Revenues by Geographic Location (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 31, 2019 | Jul. 31, 2019 | Apr. 30, 2019 | Jan. 31, 2019 | Oct. 31, 2018 | Jul. 31, 2018 | Apr. 30, 2018 | Jan. 31, 2018 | Oct. 31, 2019 | Oct. 31, 2018 | Oct. 31, 2017
Schedule Of Revenues By Geographic Area [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 11,041 | $ 22,712 | $ 9,216 | $ 17,783 | $ 17,884 | $ 12,110 | $ 20,830 | $ 38,613 | $ 60,752 | $ 89,437 | $ 95,666
UNITED STATES |  |  |  |  |  |  |  |  |  |  |
Schedule Of Revenues By Geographic Area [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 56,211 | 50,953 | 47,539
SOUTH KOREA |  |  |  |  |  |  |  |  |  |  |
Schedule Of Revenues By Geographic Area [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 2,686 | 36,279 | 44,217
ENGLAND |  |  |  |  |  |  |  |  |  |  |
Schedule Of Revenues By Geographic Area [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 1,496 | 387 | 368
GERMANY |  |  |  |  |  |  |  |  |  |  |
Schedule Of Revenues By Geographic Area [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 359 | 1,795 | 2,740
CANADA |  |  |  |  |  |  |  |  |  |  |
Schedule Of Revenues By Geographic Area [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ 23 | 729
SPAIN |  |  |  |  |  |  |  |  |  |  |
Schedule Of Revenues By Geographic Area [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | $ 73

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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