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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

X

- Definition

Decrease in deferred tax liability.

+ References

No definition available.

+ Details

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- Definition

Excess percentage of common shares outstanding approved.

+ References

No definition available.

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X

- Definition

Preferred stock offering month and year.

+ References

No definition available.

+ Details

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X

- 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

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X

- 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

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X

- 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.

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- Details

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- Details

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