Represents the class of warrants or rights for the exercisable period

No definition available.

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- Definition

Expiration period covering the number of months after the date of issuance of warrants.

+ References

No definition available.

+ Details

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- Definition

Represents the fair value of warrant liability.

+ References

No definition available.

+ Details

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- Definition

Number of new stock issued during the period due to and exercise of warrants.

+ References

No definition available.

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- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i)(4))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
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-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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- Definition

Number of warrants or rights outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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- Definition

Amount of expense (income) related to adjustment to fair value of warrant liability.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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- Definition

The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section S99
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- Definition

Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.

+ References

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- Definition

The cash inflow associated with the amount received from holders exercising their stock warrants.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585

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- Definition

Price of a single share of a number of saleable stocks of a company.

+ References

No definition available.

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Value of input used to measure outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

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- Definition

Period between issuance and expiration of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

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STOCKHOLDERS? EQUITY - Preferred Stock & Warrants (Details)			9 Months Ended	12 Months Ended
	Nov. 20, 2018 USD ($) shares	Oct. 23, 2017 USD ($) $ / shares shares	Oct. 31, 2018 USD ($)	Jan. 31, 2019 USD ($) $ / shares shares	Jan. 31, 2018 USD ($) shares	Oct. 31, 2019 $ / shares shares	Mar. 31, 2019 $ / shares	Nov. 20, 2018 $ / shares	Nov. 20, 2018 shares	Nov. 20, 2018	Nov. 20, 2018 item	Nov. 24, 2017 $ / shares	Jul. 31, 2017 $ / shares	Apr. 30, 2017 $ / shares shares	Sep. 30, 2016	Sep. 30, 2016 $ / shares	Sep. 30, 2016 shares	Sep. 30, 2016	Sep. 30, 2016 USD ($)	Sep. 30, 2016 item
Equity
Proceeds from warrant exercises to purchase common stock \| $			$ 6,961,000	$ 10,546,000	$ 644,000
Series A convertible preferred stock, shares authorized				10,000,000	10,000,000	10,000,000
Series A convertible preferred stock, shares issued				0	0	0
Incremental fair value of warrants \| $				$ 874,000	$ 151,000
Private placement
Equity
Share price (in dollars per share) \| $ / shares							$ 0.09						$ 0.36	$ 0.78
Warrants exercise price (in dollars per share) \| $ / shares														$ 0.90
Number of shares of common stock subject to warrant (in shares)														3,365,385
Warrant
Equity
Warrants outstanding						4,936,129
Warrant \| Series B Warrants
Equity
Warrants exercise price (in dollars per share) \| $ / shares								$ 6.25				$ 3.50
Issuance of common stock due to exercise of warrants (in shares)	1,066,670
Warrant \| New Warrants
Equity
Warrants exercise price (in dollars per share) \| $ / shares								$ 4.10
Warrants expiry after number of months from issuance	30 months
Warrants exercisable period after anniversary of issuance (in months)	6 months
Warrant \| New Warrants \| Maximum
Equity
Number of shares of common stock subject to warrant (in shares)									1,066,670
Warrants related to September to November 2014 financing \| Warrant
Equity
Warrants exercise price (in dollars per share) \| $ / shares						$ 92.50
Warrants outstanding						19,762
Warrants related to June 2015 financing \| Warrant
Equity
Warrants exercise price (in dollars per share) \| $ / shares				$ 2.75		$ 68.75
Warrants outstanding				109,091		4,363
Warrants related to April 2016 financing \| Warrant
Equity
Warrants exercise price (in dollars per share) \| $ / shares				$ 1.20		$ 30.00
Warrants outstanding				1,952,000		70,581
Warrants related to September 2016 financing \| Warrant
Equity
Warrants exercise price (in dollars per share) \| $ / shares				$ 0.75		$ 18.75										$ 18.75
Warrant liability \| $				$ 11,000															$ 566,000
Number of shares of common stock subject to warrant (in shares)																	51,466
Warrants outstanding				1,286,501		51,466
Warrants related to September 2016 financing \| Warrant \| Risk-free interest rate
Equity
Warrants, measurement input																		1.1		1.1
Warrants related to September 2016 financing \| Warrant \| Contractual term
Equity
Warrants, contractual term															5 years
Warrants related to September 2016 financing \| Warrant \| Expected volatility
Equity
Warrants, measurement input																		95.8		95.8
Warrants related to September 2016 financing \| Warrant \| Dividend rate
Equity
Warrants, measurement input																		0		0
Warrants related to November 2016 financing \| Warrant
Equity
Warrants exercise price (in dollars per share) \| $ / shares				$ 0.35		$ 8.75
Warrants outstanding				30,406,061		1,216,230
Warrants related to November 2016 financing, tranche two \| Warrant
Equity
Warrants exercise price (in dollars per share) \| $ / shares				$ 0.44		$ 10.938
Warrants outstanding				895,450		35,818
Warrants related to November 2016 financing, tranche three \| Warrant
Equity
Warrants exercise price (in dollars per share) \| $ / shares				$ 0.33		$ 8.25
Warrants outstanding				198,214		7,926
Warrants related to April 2017 financing \| Warrant
Equity
Warrants exercise price (in dollars per share) \| $ / shares				$ 0.90		$ 22.50
Warrants outstanding				801,282		32,053
Warrants related to October 2017 financing \| Warrant
Equity
Warrants exercise price (in dollars per share) \| $ / shares		$ 0.24		$ 0.30		$ 7.50
Number of shares of common stock subject to warrant (in shares)		2,564,103
Warrants outstanding				3,846,152		153,848
Incremental fair value of warrants \| $		$ 151,000
Warrants related to October 2017 financing \| Warrant \| Risk-free interest rate
Equity
Warrants, measurement input		2.03
Warrants related to October 2017 financing \| Warrant \| Contractual term
Equity
Warrants, contractual term		5 years
Warrants related to October 2017 financing \| Warrant \| Expected volatility
Equity
Warrants, measurement input		83.9
Warrants related to October 2017 financing \| Warrant \| Dividend rate
Equity
Warrants, measurement input		0
Warrants related to November 2017 financing \| Warrant
Equity
Warrants exercise price (in dollars per share) \| $ / shares				$ 0.20		$ 5.00
Warrants outstanding				56,935,191		2,277,412
Warrants related to November 2017 financing, tranche two \| Warrant
Equity
Warrants exercise price (in dollars per share) \| $ / shares				$ 0.25
Warrants outstanding				33,422,061
Incremental fair value of warrants \| $	$ 874,000
Warrants related to November 2017 financing, tranche two \| Warrant \| Risk-free interest rate
Equity
Warrants, measurement input										2.51
Warrants related to November 2017 financing, tranche two \| Warrant \| Contractual term
Equity
Warrants, contractual term	6 months
Warrants related to November 2017 financing, tranche two \| Warrant \| Expected volatility
Equity
Warrants, measurement input										78.4	78.4
Warrants related to November 2017 financing, tranche two \| Warrant \| Dividend rate
Equity
Warrants, measurement input										0	0
Warrants related To November 2018 financing \| Warrant
Equity
Warrants exercise price (in dollars per share) \| $ / shares				$ 0.164		$ 4.10
Warrants outstanding				26,666,666		1,066,670