Balance Sheet - Accounts Receivable (Detail) - USD ($) $ in Thousands	Apr. 30, 2020	Jan. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Current accounts receivable	$ 10,192	$ 15,975
Long-term accounts receivable	535	403
Accounts receivable	10,727	16,378
Less current portion of allowance for doubtful accounts	(2,196)	(4,054)
Less long-term portion of allowance for doubtful accounts	0	0
Less total allowance for doubtful accounts	(2,196)	(4,054)
Current accounts receivable, net of allowance for doubtful accounts	7,996	11,921
Long-term accounts receivable, net of allowance for doubtful accounts	535	403
Total accounts receivable, net of allowance for doubtful accounts	$ 8,531	$ 12,324