CONSOLIDATED STATEMENTS OF CONVERTIBLE REDEEMABLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) - USD ($) $ in Thousands	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Series A Convertible Redeemable Preferred Stock	Series A Convertible Preferred Stock	Total
Balance at Jan. 31, 2015				$ 6,823
Balance (in shares) at Jan. 31, 2015				4,207,987
Increase (decrease) in convertible redeemable preferred stock
Issuance of common and preferred stock, net of expenses				$ (7,226)		$ (7,226)
Issuance of common and preferred stock, net of expenses (in shares)				(4,207,987)
Interest on preferred stock		$ (201)		$ 201		(201)
Balance Beginning, Amount at Jan. 31, 2015	$ 11	4,416	$ (10,634)			(6,207)
Balance Beginning, Shares at Jan. 31, 2015	11,415,416
Increase (decrease) in stockholders' deficit
Issuance of common and preferred stock, net of expenses	$ 12	20,530				20,542
Issuance of common and preferred stock, net of expenses (in shares)	12,508,395
Issuance of common stock due to exercise of options	$ 1	82				83
Issuance of common stock due to exercise of options (in shares)	666,157
Issuance of common stock due to exercise of warrants	$ 1	1,486				1,487
Issuance of common stock due to exercise of warrants (in shares)	618,716
Expense related to the modification of warrants		436				436
Conversion of convertible notes payable to common stock		500				500
Stock-based compensation		1,214				1,214
Interest on preferred stock		(201)		201		(201)
Accretion of stock issuance costs		(202)		$ 202		(202)
Net and comprehensive loss			(15,598)			(15,598)
Balance Ending, Amount at Jan. 31, 2016	$ 25	28,261	(26,232)			2,054
Balance Ending, Shares at Jan. 31, 2016	25,208,684
Increase (decrease) in convertible redeemable preferred stock
Issuance of common and preferred stock, net of expenses (in shares)					1,515
Balance at Jan. 31, 2017					$ 1,515
Increase (decrease) in stockholders' deficit
Issuance of common and preferred stock, net of expenses	$ 40	15,283			1,389	16,712
Issuance of common and preferred stock, net of expenses (in shares)	40,453,182
Issuance of common stock due to exercise of options	$ 1	40				41
Issuance of common stock due to exercise of options (in shares)	131,000
Conversion of convertible notes payable to common stock	$ 2	1,643				1,645
Conversion of convertible notes payable to common stock (in shares)	1,926,711
Stock-based compensation		1,491				1,491
Deemed dividend for preferred stock		(126)			$ 126	(126)
Fair value of warrants issued		(566)				(566)
Net and comprehensive loss			(18,406)			(18,406)
Balance Ending, Amount at Jan. 31, 2017	$ 68	$ 46,026	$ (44,638)			$ 2,971
Balance Ending, Shares at Jan. 31, 2017	67,719,577				1,515