Quarterly report pursuant to Section 13 or 15(d)

Income Taxes - Additional Information (Detail)

v3.19.3
Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 11 Months Ended
Mar. 04, 2019
Jan. 31, 2018
Oct. 31, 2019
Oct. 31, 2018
Oct. 31, 2019
Oct. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]              
Income tax benefit     $ 53 $ 775 $ 214 $ 2,421  
Corporate federal income tax rate   21.00%         35.00%
Preferred shares purchase rights, declared date as dividend Mar. 04, 2019            
Preferred shares purchase rights for each common stock 1            
Preferred shares purchase rights, record date as dividend Mar. 15, 2019            
Tax benefits preservation plan expiration date         Mar. 04, 2022