Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - Summary of Stock Based Compensation Expense Recognized (Detail)

v3.19.1
Stockholders' Equity - Summary of Stock Based Compensation Expense Recognized (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 31, 2019
Jan. 31, 2018
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]    
Stock-based compensation expense $ 2,939 $ 2,696
Cost of Revenue [Member]    
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]    
Stock-based compensation expense   3
Research and Development [Member]    
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]    
Stock-based compensation expense 186 102
Selling and Marketing [Member]    
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]    
Stock-based compensation expense 373 360
General and Administrative [Member]    
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]    
Stock-based compensation expense $ 2,380 $ 2,231