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
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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
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-Topic 235
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- Definition

Number of warrants or rights outstanding.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

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

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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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
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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
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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)
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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
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CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS’ EQUITY - Preferred Stock & Warrants (Details)			3 Months Ended
	Nov. 20, 2018 USD ($) item $ / shares shares	Oct. 23, 2017 USD ($) item $ / shares shares	Apr. 30, 2018 USD ($)	Apr. 30, 2019 $ / shares shares	Mar. 31, 2019 $ / shares	Jan. 31, 2019 shares	Oct. 31, 2018 USD ($)	Nov. 24, 2017 $ / shares	Sep. 30, 2016 USD ($) item $ / shares shares
Equity
Proceeds from warrant exercises to purchase common stock \| $			$ 6,961,000
Series A convertible preferred stock, shares authorized				10,000,000		10,000,000
Series A convertible preferred stock, shares issued				0		0
Private placement
Equity
Share price (in dollars per share) \| $ / shares					$ 0.09
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)	1,067,670
Warrants related to January 2014 agreement \| Warrant
Equity
Warrants exercise price (in dollars per share) \| $ / shares				$ 46.25
Warrants outstanding				11,581
Warrants related to May 2014 agreement \| Warrant
Equity
Warrants exercise price (in dollars per share) \| $ / shares				$ 50.875
Warrants outstanding				12,656
Warrants related to April to November 2014 financing \| Warrant
Equity
Warrants exercise price (in dollars per share) \| $ / shares				$ 92.50
Warrants outstanding				61,062
Warrants related to June 2015 financing \| Warrant
Equity
Warrants exercise price (in dollars per share) \| $ / shares				$ 68.75
Warrants outstanding				4,363
Warrants related to April 2016 financing \| Warrant
Equity
Warrants exercise price (in dollars per share) \| $ / shares				$ 30.00
Warrants outstanding				70,581
Warrants related to September 2016 financing \| Warrant
Equity
Warrants exercise price (in dollars per share) \| $ / shares				$ 18.75					$ 18.75
Warrant liability \| $							$ 2,000		$ 566,000
Number of shares of common stock subject to warrant (in shares)									51,466
Warrants outstanding				51,466
Warrants related to September 2016 financing \| Warrant \| Risk-free interest rate
Equity
Warrants, measurement input \| item									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 \| item									95.8
Warrants related to September 2016 financing \| Warrant \| Dividend rate
Equity
Warrants, measurement input \| item									0
Warrants related to November 2016 financing \| Warrant
Equity
Warrants exercise price (in dollars per share) \| $ / shares				$ 8.75
Warrants outstanding				1,216,230
Warrants related to November 2016 financing, tranche two \| Warrant
Equity
Warrants exercise price (in dollars per share) \| $ / shares				$ 10.938
Warrants outstanding				35,818
Warrants related to November 2016 financing, tranche three \| Warrant
Equity
Warrants exercise price (in dollars per share) \| $ / shares				$ 8.25
Warrants outstanding				7,926
Warrants related to April 2017 financing \| Warrant
Equity
Warrants exercise price (in dollars per share) \| $ / shares				$ 22.50
Warrants outstanding				32,053
Warrants related to October 2017 financing \| Warrant
Equity
Warrants exercise price (in dollars per share) \| $ / shares		$ 6.00		$ 7.50
Number of shares of common stock subject to warrant (in shares)		102,564
Warrants outstanding				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 \| item		0
Warrants related to November 2017 financing \| Warrant
Equity
Warrants exercise price (in dollars per share) \| $ / shares				$ 5.00
Warrants outstanding				2,277,412
Warrants related to November 2017 financing, tranche two \| Warrant
Equity
Warrants exercise price (in dollars per share) \| $ / shares				$ 6.25
Warrants outstanding				1,336,886
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 \| item	78.4
Warrants related to November 2017 financing, tranche two \| Warrant \| Dividend rate
Equity
Warrants, measurement input \| item	0
Warrants related To November 2018 financing \| Warrant
Equity
Warrants exercise price (in dollars per share) \| $ / shares				$ 4.100
Warrants outstanding				1,066,670
Common Stock \| Warrants related to October 2017 financing \| Warrant
Equity
Warrants exercise price (in dollars per share) \| $ / shares		$ 7.50
Warrants outstanding		158,848