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Subsequent Events - Additional Information (Details) - USD ($) $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Jan. 01, 2018 | Dec. 14, 2017 | Oct. 31, 2017 | Oct. 31, 2016 | Oct. 31, 2015
Subsequent Event [Line Items] |  |  |  |  |
Common stock, shares authorized |  |  | 125,000,000 | 75,000,000 |
U.S. federal tax rate |  |  | 34.00% | 34.00% | 34.00%
Subsequent Event [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Common stock, shares authorized |  | 225,000,000 |  |  |
Excess percentage of common shares outstanding |  | 19.90% |  |  |
U.S. federal tax rate | 21.00% |  |  |  |
Subsequent Event [Member] | IPR&D [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Decrease in deferred tax liability | $ 1.0 |  |  |  |
Subsequent Event [Member] | Convertible Preferred Offering [Member] | Series C Preferred Stock [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Preferred stock offering date |  | 2017-09 |  |  |

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- Definition Excess percentage of common shares outstanding approved. + References No definition available. + Details
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- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. + References Reference 1: 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(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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