DOCUMENT AND ENTITY INFORMATION - shares	9 Months Ended
	Oct. 31, 2017	Nov. 30, 2017
DOCUMENT AND ENTITY INFORMATION
Entity Registrant Name	BioPharmX Corp
Entity Central Index Key	0001504167
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Oct. 31, 2017
Current Fiscal Year End Date	--01-31
Is Entity's Reporting Status Current?	Yes
Entity Filer Category	Smaller Reporting Company
Entity Common Stock, Shares Outstanding		127,508,938
Document Fiscal Period Focus	Q3
Document Fiscal Year Focus	2018
Trading Symbol	BPMX