CONSOLIDATED STATEMENTS OF CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Series A Convertible Preferred Stock	Total
Balance Beginning, Amount at Jan. 31, 2017	$ 68	$ 46,026	$ (44,638)	$ 1,515	$ 2,971
Balance Beginning, Shares at Jan. 31, 2017	67,719,577			1,515
Increase (decrease) in stockholders' deficit
Issuance of common stock, net of expenses	$ 57	15,992			16,049
Issuance of common stock, net of expenses (in shares)	57,185,258
Issuance of common stock due to exercise of options		10			10
Issuance of common stock due to exercise of options (in shares)	40,000
Issuance of common stock due to exercise of warrants	$ 31	613			644
Issuance of common stock due to exercise of warrants (in shares)	30,789,103
Conversion of Series A convertible preferred stock to common stock	$ 4	1,511		$ (1,515)
Conversion of Series A convertible preferred stock to common stock	4,328,571			(1,515)
Stock-based compensation expense		1,887			1,887
Fair value of modification of warrants		151			151
Net and comprehensive loss			(16,640)		(16,640)
Balance Ending, Amount at Jan. 31, 2018	$ 160	66,190	(61,278)		5,072
Balance Ending, Shares at Jan. 31, 2018	160,062,509
Increase (decrease) in stockholders' deficit
Cumulative-effect adjustment from adoption of new accounting pronouncement			2		2
Issuance of common stock due to exercise of options		1			1
Issuance of common stock due to exercise of options (in shares)	140,039
Issuance of common stock due to exercise of warrants	$ 58	10,488			10,546
Issuance of common stock due to exercise of warrants (in shares)	58,112,748
Stock-based compensation expense		2,061			2,061
Fair value of modification of warrants		874			874
Net and comprehensive loss			(17,258)		(17,258)
Balance Ending, Amount at Jan. 31, 2019	$ 218	$ 79,614	$ (78,534)		$ 1,298
Balance Ending, Shares at Jan. 31, 2019	218,315,296