Income Taxes - Summary of Tax Valuation Allowance (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2019
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	$ 14,670
Balance at End of Period	17,962	$ 14,670
Valuation Allowance of Deferred Tax Assets [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	14,670	12,526	$ 18,538
Additional Charged to Expenses	3,292	2,144	1,978
Additions Charged to Other Account	0	0	0
Deductions Charged to Expenses or Other Accounts	0	0	(7,990)
Balance at End of Period	$ 17,962	$ 14,670	$ 12,526