CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Total
Balance Beginning, Amount at Jan. 31, 2018	$ 6	$ 66,344	$ (61,278)	$ 5,072
Balance Beginning, Shares at Jan. 31, 2018	6,402,500
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)	406
Issuance of common stock due to exercise of warrants	$ 1	6,960		6,961
Issuance of common stock due to exercise of warrants (in shares)	1,257,843
Stock-based compensation expense		593		593
Net and comprehensive loss			(4,402)	(4,402)
Balance Ending, Amount at Apr. 30, 2018	$ 8	73,897	(65,678)	8,227
Balance Ending, Shares at Apr. 30, 2018	7,660,749
Balance Beginning, Amount at Jan. 31, 2018	$ 6	66,344	(61,278)	5,072
Balance Beginning, Shares at Jan. 31, 2018	6,402,500
Increase (decrease) in stockholders' deficit
Net and comprehensive loss				(8,812)
Balance Ending, Amount at Jul. 31, 2018	$ 8	74,343	(70,088)	4,263
Balance Ending, Shares at Jul. 31, 2018	7,660,971
Balance Beginning, Amount at Apr. 30, 2018	$ 8	73,897	(65,678)	8,227
Balance Beginning, Shares at Apr. 30, 2018	7,660,749
Increase (decrease) in stockholders' deficit
Issuance of common stock due to exercise of options (in shares)	222
Stock-based compensation expense		446		446
Net and comprehensive loss			(4,410)	(4,410)
Balance Ending, Amount at Jul. 31, 2018	$ 8	74,343	(70,088)	4,263
Balance Ending, Shares at Jul. 31, 2018	7,660,971
Balance Beginning, Amount at Jan. 31, 2019	$ 9	79,823	(78,534)	1,298
Balance Beginning, Shares at Jan. 31, 2019	8,732,612
Increase (decrease) in stockholders' deficit
Issuance of common stock, net of issuance costs	$ 1	3,553		3,554
Issuance of common stock, net of issuance costs (in shares)	1,745,800
Issuance of common stock due to exercise of options		4		4
Issuance of common stock due to exercise of options (in shares)	1,667
Stock-based compensation expense		191		191
Net and comprehensive loss			(3,623)	(3,623)
Balance Ending, Amount at Apr. 30, 2019	$ 10	83,571	(82,157)	1,424
Balance Ending, Shares at Apr. 30, 2019	10,480,079
Balance Beginning, Amount at Jan. 31, 2019	$ 9	79,823	(78,534)	1,298
Balance Beginning, Shares at Jan. 31, 2019	8,732,612
Increase (decrease) in stockholders' deficit
Net and comprehensive loss				(6,269)
Balance Ending, Amount at Jul. 31, 2019	$ 14	87,001	(84,803)	2,212
Balance Ending, Shares at Jul. 31, 2019	14,187,583
Balance Beginning, Amount at Apr. 30, 2019	$ 10	83,571	(82,157)	1,424
Balance Beginning, Shares at Apr. 30, 2019	10,480,079
Increase (decrease) in stockholders' deficit
Issuance of common stock, net of issuance costs	$ 4	3,253		3,257
Issuance of common stock, net of issuance costs (in shares)	3,707,504
Stock-based compensation expense		177		177
Net and comprehensive loss			(2,646)	(2,646)
Balance Ending, Amount at Jul. 31, 2019	$ 14	$ 87,001	$ (84,803)	$ 2,212
Balance Ending, Shares at Jul. 31, 2019	14,187,583