STOCKHOLDERS' DEFICIT - Range of Exercise Price (Details) - Equity Incentive Plans and Inducement Grants - USD ($)	3 Months Ended
Apr. 30, 2020	Apr. 30, 2019
Options Outstanding
Number outstanding	97,870
Weighted Average Remaining Contractual Life (in Years)	8 years 6 months 18 days
Weighted Average Exercise Prices	$ 45.81
Options Vested and Exercisable
Number Vested and Exercisable	45,479
Weighted Average Exercise Prices	$ 66.01
Additional disclosures
Stock options exercised	0
Maximum
Additional disclosures
Intrinsic value of stock options exercised		$ 1,000
$5.28 - $10.08
Summary of significant ranges of outstanding and exercisable options
Lower range limit	$ 5.28
Upper range limit	$ 10.08
Options Outstanding
Number outstanding	54,551
Weighted Average Remaining Contractual Life (in Years)	9 years 1 month 21 days
Weighted Average Exercise Prices	$ 9.41
Options Vested and Exercisable
Number Vested and Exercisable	19,484
Weighted Average Exercise Prices	$ 9.61
$10.09 - $51.00
Summary of significant ranges of outstanding and exercisable options
Lower range limit	10.09
Upper range limit	$ 51.00
Options Outstanding
Number outstanding	8,010
Weighted Average Remaining Contractual Life (in Years)	7 years 11 months 19 days
Weighted Average Exercise Prices	$ 34.52
Options Vested and Exercisable
Number Vested and Exercisable	6,431
Weighted Average Exercise Prices	$ 32.95
$51.01 - $126.00
Summary of significant ranges of outstanding and exercisable options
Lower range limit	51.01
Upper range limit	$ 126.00
Options Outstanding
Number outstanding	29,280
Weighted Average Remaining Contractual Life (in Years)	8 years 2 months 12 days
Weighted Average Exercise Prices	$ 68.45
Options Vested and Exercisable
Number Vested and Exercisable	13,862
Weighted Average Exercise Prices	$ 71.02
$126.01 - $222.00
Summary of significant ranges of outstanding and exercisable options
Lower range limit	126.01
Upper range limit	$ 222.00
Options Outstanding
Number outstanding	4,496
Weighted Average Remaining Contractual Life (in Years)	5 years 9 months 22 days
Weighted Average Exercise Prices	$ 203.98
Options Vested and Exercisable
Number Vested and Exercisable	4,169
Weighted Average Exercise Prices	$ 202.96
$222.01 - $342.00
Summary of significant ranges of outstanding and exercisable options
Lower range limit	222.01
Upper range limit	$ 342.00
Options Outstanding
Number outstanding	533
Weighted Average Remaining Contractual Life (in Years)	6 years 18 days
Weighted Average Exercise Prices	$ 242.25
Options Vested and Exercisable
Number Vested and Exercisable	533
Weighted Average Exercise Prices	$ 242.25
$342.01 - $900.00
Summary of significant ranges of outstanding and exercisable options
Lower range limit	342.01
Upper range limit	$ 900.00
Options Outstanding
Number outstanding	1,000
Weighted Average Remaining Contractual Life (in Years)	4 years 11 months 1 day
Weighted Average Exercise Prices	$ 642.99
Options Vested and Exercisable
Number Vested and Exercisable	1,000
Weighted Average Exercise Prices	$ 642.99

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Number of options outstanding, including both vested and non-vested options.

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Number of fully vested and expected to vest exercisable options that may be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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