Condensed Consolidated Balance Sheets (Parenthetical) $ in Thousands	Apr. 30, 2020 USD ($) $ / shares shares	Jan. 31, 2020 USD ($) $ / shares shares
Condensed Consolidated Balance Sheets
Discount and issuance costs on notes payable | $	$ 174	$ 522
Series A convertible preferred stock, par value (in dollars per share) | $ / shares	$ 0.001	$ 0.001
Series A convertible preferred stock, shares authorized	10,000,000	10,000,000
Series A convertible preferred stock, shares issued	0	0
Series A convertible preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share) | $ / shares	$ 0.001	$ 0.001
Common stock, shares authorized	450,000,000	450,000,000
Common stock, shares issued	1,523,185	1,268,991
Common stock, shares outstanding	1,523,185	1,268,991