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STOCKHOLDERS' EQUITY (DEFICIT) - Stock Option Activities (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Aug. 31, 2018
Mar. 31, 2017
Jan. 31, 2020
Jan. 31, 2019
Jan. 31, 2018
Weighted Average Exercise Prices          
Granted     $ 0.44 $ 3.00  
The Plans          
Available for Grant          
Available for grant, beginning     2,107,575 75,396  
Shares authorized for issuance       2,000,000  
Granted     (893,820) (417,660)  
Available for grant, ending     1,737,986 2,107,575 75,396
Shares          
Outstanding, Beginning     917,945 988,452  
Granted     893,820 417,660  
Exercised     (1,667) (11,129)  
Outstanding, Ending     1,234,492 917,945 988,452
Vested and exercisable     508,154    
Vested and expected to vest     1,069,509    
Weighted Average Exercise Prices          
Outstanding, Beginning     $ 9.02 $ 10.30  
Granted     0.84 5.23  
Exercised     2.50 2.53  
Outstanding, Ending     4.02 $ 9.02 $ 10.30
Vested and exercisable     6.43    
Vested and expected to vest     $ 4.27    
Remaining Contractual Life          
Outstanding     8 years 4 months 13 days 7 years 11 months 1 day 9 years 2 months 1 day
Vested and exercisable     7 years 3 months 18 days    
Vested and expected to vest     8 years 3 months    
Aggregate Intrinsic Value          
Outstanding     $ 1 $ 23 $ 304
Vested and expected to vest     $ 1    
Subsequent to termination of the 2014 plan          
Available for Grant          
Canceled     51,375 27,199  
Shares          
Canceled     (51,375) (27,199)  
Weighted Average Exercise Prices          
Canceled     $ 25.43 $ 25.33  
2016 Equity Incentive Plan          
Available for Grant          
Shares authorized for issuance 2,000,000 800,000      
Canceled     524,231 449,839  
Shares          
Canceled     (524,231) (449,839)  
Weighted Average Exercise Prices          
Canceled     $ 5.26 $ 7.52  
Outside the 2014 Equity Incentive Plan          
Available for Grant          
Granted       (16,000)  
Canceled     24,333 11,400  
Shares          
Outstanding, Beginning     31,000 26,400  
Granted       16,000  
Canceled     (24,333) (11,400)  
Outstanding, Ending     6,667 31,000 26,400
Vested and exercisable     6,667    
Vested and expected to vest     6,667    
Weighted Average Exercise Prices          
Outstanding, Beginning     $ 17.86 $ 35.90  
Granted       4.75  
Canceled     21.46 41.22  
Outstanding, Ending     4.75 $ 17.86 $ 35.90
Vested and exercisable     4.75    
Vested and expected to vest     $ 4.75    
Remaining Contractual Life          
Outstanding       6 years 7 months 6 days 7 years 8 months 19 days
Outside the 2014 Equity Incentive Plan | First anniversary          
Available for Grant          
Vesting percentage     25.00%    
Outside the 2014 Equity Incentive Plan | Subsequent to first anniversary          
Available for Grant          
Vesting percentage     2.083%