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CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS’ EQUITY - Stock Option Activities (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Aug. 31, 2018
Mar. 31, 2017
Apr. 30, 2019
Jan. 31, 2019
Plans        
Available for Grant        
Available for grant, beginning     2,107,575  
Granted     (16,720)  
Available for grant, ending     2,160,035 2,107,575
Shares        
Outstanding, Beginning     917,945  
Granted     16,720  
Exercised     (1,667)  
Outstanding, Ending     835,338 917,945
Vested and exercisable     323,214  
Vested and expected to vest     711,218  
Weighted Average Exercise Prices        
Outstanding, Beginning     $ 9.02  
Granted     3.21  
Exercised     2.50  
Outstanding, Ending     8.27 $ 9.02
Vested and exercisable     11.70  
Vested and expected to vest     $ 8.67  
Remaining Contractual Life        
Outstanding     8 years 4 months 6 days 7 years 11 months 1 day
Vested and exercisable     7 years 2 months 12 days  
Vested and expected to vest     8 years 2 months 16 days  
Aggregate Intrinsic Value        
Outstanding       $ 23
2014 Equity Incentive Plan        
Available for Grant        
Canceled     28,480  
Shares        
Canceled     (28,480)  
Weighted Average Exercise Prices        
Canceled     $ 28.27  
2016 Equity Incentive Plan        
Available for Grant        
Shares authorized for issuance 2,000,000 800,000    
Canceled     69,180  
Shares        
Canceled     (69,180)  
Weighted Average Exercise Prices        
Canceled     $ 8.84  
Outside of the 2016 Equity Incentive Plan        
Available for Grant        
Canceled     6,000  
Shares        
Outstanding, Beginning     31,000  
Canceled     (6,000)  
Outstanding, Ending     25,000 31,000
Vested and exercisable     12,542  
Vested and expected to vest     21,833  
Weighted Average Exercise Prices        
Outstanding, Beginning     $ 17.86  
Canceled     38.75  
Outstanding, Ending     12.85 $ 17.86
Vested and exercisable     18.88  
Vested and expected to vest     $ 13.95  
Remaining Contractual Life        
Outstanding     7 years 11 months 1 day 6 years 7 months 6 days
Vested and exercisable     7 years 3 months 18 days  
Vested and expected to vest     7 years 9 months 22 days  
Outside of the 2016 Equity Incentive Plan | First anniversary        
Available for Grant        
Vesting percentage     25.00%  
Outside of the 2016 Equity Incentive Plan | Subsequent to first anniversary        
Available for Grant        
Vesting percentage     2.083%