Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Additional Information (Detail)

v3.23.1
Fair Value Measurements - Additional Information (Detail) - USD ($)
3 Months Ended 12 Months Ended
Apr. 30, 2023
Jan. 31, 2023
Fair Value Measurements Disclosure [Line Items]    
Assets transferred between fair value hierarchy categories $ 0 $ 0
Fair Value, Recurring [Member]    
Fair Value Measurements Disclosure [Line Items]    
Cash equivalents 2,399,000 2,389,000
Liabilities measured at fair value 0 0
Fair Value, Recurring [Member] | US Treasury Securities [Member]    
Fair Value Measurements Disclosure [Line Items]    
Cash equivalents 2,400,000 2,400,000
Level 1 [Member] | Fair Value, Recurring [Member]    
Fair Value Measurements Disclosure [Line Items]    
Cash equivalents $ 2,399,000 $ 2,389,000