Balance Sheet - Continuing Operations - Accounts Receivable (Detail) - USD ($) $ in Thousands	Apr. 30, 2021	Jan. 31, 2021
Current
Accounts receivable	$ 4,601	$ 5,695
Less allowance for doubtful accounts	(952)	(948)
Accounts receivable net of allowance for doubtful accounts	3,649	4,747
Long-term
Accounts receivable	0	0
Less allowance for doubtful accounts	0	0
Accounts receivable net of allowance for doubtful accounts	0	0
Total
Accounts receivable	4,601	5,695
Less allowance for doubtful accounts	(952)	(948)
Accounts receivable net of allowance for doubtful accounts	$ 3,649	$ 4,747