Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - Stock Option Activity (Detail)

v3.19.1
Stockholders' Equity - Stock Option Activity (Detail) - USD ($)
12 Months Ended
Jan. 31, 2019
Jan. 31, 2018
Equity [Abstract]    
Shares, Outstanding at beginning of period 3,240,105  
Shares, Granted 1,420,000  
Shares, Exercised (20,937)  
Shares, Forfeited (514,966)  
Shares, Outstanding at end of period 4,124,202 3,240,105
Shares, Vested and expected to vest at end of period 3,324,203  
Shares, Options exercisable at end of period 974,793  
Weighted Average Exercise Price, Outstanding at beginning of period $ 3.94  
Weighted Average Exercise Price, Granted 1.83  
Weighted Average Exercise Price, Exercised 2.56  
Weighted Average Exercise Price, Forfeited 3.49  
Weighted Average Exercise Price, Outstanding at end of period 3.28 $ 3.94
Weighted Average Exercise Price, Vested and expected to vest at end of period 2.63  
Weighted Average Exercise Price, Options exercisable at end of period $ 3.33  
Weighted Average Remaining Contractual Term, Outstanding at beginning of period 6 years 11 months 15 days 8 years
Weighted Average Remaining Contractual Term, Vested and expected to vest at end of period 6 years 11 months 15 days  
Weighted Average Remaining Contractual Term, Options exercisable at end of period 4 years 10 months 20 days  
Aggregate Intrinsic Value, Outstanding $ 32,000 $ 683,405
Aggregate Intrinsic Value, Vested and expected to vest at end of period $ 32,000