Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Summary of Marketable Securities by Security Type (Detail)

v3.21.1
Fair Value Measurements - Summary of Marketable Securities by Security Type (Detail) - USD ($)
$ in Thousands
Jan. 31, 2021
Jan. 31, 2020
Schedule Of Available For Sale Securities [Line Items]    
Amortized Cost $ 249 $ 4,564
Gross Unrealized Gains 3 53
Fair Value 252 4,617
U.S. Treasury Notes and Bonds [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Amortized Cost 249 3,310
Gross Unrealized Gains 3 50
Fair Value $ 252 3,360
Corporate Bonds [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Amortized Cost   1,254
Gross Unrealized Gains   3
Fair Value   $ 1,257