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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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Summary of Significant Accounting Policies (Details 3) (USD $) In Thousands, except Share data, unless otherwise specified	1 Months Ended		3 Months Ended		12 Months Ended
	Jan. 31, 2015	Jan. 31, 2014	Apr. 30, 2015	Apr. 30, 2014	Dec. 31, 2014	Dec. 31, 2013
Numerator:
Net loss available to BioPharmX common stockholders	$ (1,237)	$ (364)	$ (3,863)	$ (1,335)	$ (8,129)	$ (1,588)
Denominator:
Weighted-average shares of common stock outstanding used in the calculation of basic net loss per share attributable to BioPharmX common stockholders	11,408,000	7,750,000			10,217,000	7,119,000
Effect of dilutive securities:
Weighted-average shares of common stock outstanding used in the calculation of diluted net loss per share attributable to BioPharmX common stockholders	11,408,000	7,750,000			10,217,000	7,119,000
Anti dilutive securities excluded from computation of diluted net loss per share			9,282,000	3,871,000
Convertible Redeemable Preferred Stock
Effect of dilutive securities:
Anti dilutive securities excluded from computation of diluted net loss per share	4,207,987				4,207,987
Stock options and awards to purchase common stock
Effect of dilutive securities:
Anti dilutive securities excluded from computation of diluted net loss per share	2,882,585	2,606,000			2,802,690	2,606,000
Common Stock Warrants
Effect of dilutive securities:
Anti dilutive securities excluded from computation of diluted net loss per share	2,702,543				2,702,543