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STOCKHOLDERS' EQUITY (DEFICIT) - Warrants (Details)
1 Months Ended 12 Months Ended
Jan. 28, 2020
USD ($)
shares
Nov. 20, 2018
USD ($)
$ / shares
shares
Jan. 31, 2020
USD ($)
$ / shares
shares
Jan. 31, 2020
USD ($)
$ / shares
shares
Jan. 31, 2019
USD ($)
shares
Mar. 31, 2019
$ / shares
Nov. 24, 2017
$ / shares
Sep. 30, 2016
USD ($)
item
$ / shares
shares
Equity                
Proceeds from warrant exercises to purchase common stock | $         $ 10,546,000      
Fair value of modification of warrants | $       $ 308,000 $ 874,000      
Preferred stock, shares authorized     10,000,000 10,000,000 10,000,000      
Preferred stock, shares issued     0 0 0      
Number of common stock exchanged underlying warrants     2,300,000          
Common stock exchanged     850,000          
Common stock liability | $     $ 383,000 $ 383,000        
Private placement                
Equity                
Share price (in dollars per share) | $ / shares           $ 0.09    
Warrant                
Equity                
Warrants outstanding     7,171,703 7,171,703        
Warrant | Series B Warrants                
Equity                
Warrants exercise price (in dollars per share) | $ / shares   $ 6.25         $ 3.50  
Issuance of common stock due to exercise of warrants (in shares)   1,066,670            
Warrant | New Warrants                
Equity                
Warrants exercise price (in dollars per share) | $ / shares   $ 4.10            
Warrants expiry after number of months from issuance   30 months            
Warrants exercisable period after anniversary of issuance (in months)   6 months            
Warrant | New Warrants | Maximum                
Equity                
Number of shares of common stock subject to warrant (in shares)   1,066,670            
Warrants related to June 2015 financing | Warrant                
Equity                
Warrants exercise price (in dollars per share) | $ / shares     $ 68.75 $ 68.75        
Warrants outstanding     4,363 4,363        
Warrants related to April 2016 financing | Warrant                
Equity                
Warrants exercise price (in dollars per share) | $ / shares     $ 30.00 $ 30.00        
Warrants outstanding     70,581 70,581        
Warrants related to September 2016 financing | Warrant                
Equity                
Warrants exercise price (in dollars per share) | $ / shares     $ 18.75 $ 18.75       $ 18.75
Warrant liability | $     $ 0 $ 0       $ 566,000
Number of shares of common stock subject to warrant (in shares)               51,466
Warrants outstanding     51,466 51,466        
Warrants related to September 2016 financing | Warrant | Risk-free interest rate                
Equity                
Warrants, measurement input | item               0.011
Warrants related to September 2016 financing | Warrant | Contractual term                
Equity                
Warrants, contractual term               5 years
Warrants related to September 2016 financing | Warrant | Expected volatility                
Equity                
Warrants, measurement input | item               0.958
Warrants related to September 2016 financing | Warrant | Dividend rate                
Equity                
Warrants, measurement input | item               0.00
Warrants related to November 2016 financing | Warrant                
Equity                
Warrants exercise price (in dollars per share) | $ / shares     $ 8.75 $ 8.75        
Warrants outstanding     1,216,230 1,216,230        
Warrants related to November 2016 financing, tranche two | Warrant                
Equity                
Warrants exercise price (in dollars per share) | $ / shares     $ 10.938 $ 10.938        
Warrants outstanding     35,818 35,818        
Warrants related to November 2016 financing, tranche three | Warrant                
Equity                
Warrants exercise price (in dollars per share) | $ / shares     $ 8.25 $ 8.25        
Warrants outstanding     7,926 7,926        
Warrants related to April 2017 financing | Warrant                
Equity                
Warrants exercise price (in dollars per share) | $ / shares     $ 22.50 $ 22.50        
Warrants outstanding     32,053 32,053        
Warrants related to October 2017 financing | Warrant                
Equity                
Warrants exercise price (in dollars per share) | $ / shares     $ 7.50 $ 7.50        
Warrants outstanding     153,848 153,848        
Warrants related to November 2017 financing | Warrant                
Equity                
Warrants exercise price (in dollars per share) | $ / shares     $ 5.00 $ 5.00        
Warrants outstanding     2,277,412 2,277,412        
Warrants related to November 2017 financing, tranche two | Warrant                
Equity                
Fair value of modification of warrants | $   $ 874,000            
Warrants related to November 2017 financing, tranche two | Warrant | Risk-free interest rate                
Equity                
Warrants, measurement input   2.51            
Warrants related to November 2017 financing, tranche two | Warrant | Contractual term                
Equity                
Warrants, contractual term   6 months            
Warrants related to November 2017 financing, tranche two | Warrant | Expected volatility                
Equity                
Warrants, measurement input   78.4            
Warrants related to November 2017 financing, tranche two | Warrant | Dividend rate                
Equity                
Warrants, measurement input   0            
Warrants related To November 2018 financing | Warrant                
Equity                
Warrants exercise price (in dollars per share) | $ / shares     $ 4.10 $ 4.10        
Warrants outstanding     1,066,670 1,066,670        
Warrants Related To January 2020 Financing | Warrant                
Equity                
Number of common stock exchanged underlying warrants 2,300,000              
Common stock exchanged 850,000              
Change in common stock liability | $ $ 280,000              
Common stock liability | $     $ 383,000 $ 383,000        
Warrants Related To January 2020 Financing | Warrant | Risk-free interest rate                
Equity                
Warrants, measurement input 1.47              
Warrants Related To January 2020 Financing | Warrant | Expected volatility | Average                
Equity                
Warrants, measurement input 106              
Warrants Related To January 2020 Financing | Warrant | Dividend rate                
Equity                
Warrants, measurement input 0              
Warrants Related To January 2020 Financing | Warrant | Other income and expense                
Equity                
Incremental value of warrant liability | $ $ 308,000              
Warrants related to notes payable | Warrant                
Equity                
Warrants exercise price (in dollars per share) | $ / shares     $ 0.01 $ 0.01        
Warrants outstanding     2,255,336 2,255,336