Balance Sheet - Accounts Receivable (Detail) - USD ($) $ in Thousands	Jul. 31, 2020	Jan. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Current accounts receivable	$ 5,483	$ 9,001
Long-term accounts receivable	0	0
Accounts receivable	5,483	9,001
Less current portion of allowance for doubtful accounts	(1,044)	(2,378)
Less long-term portion of allowance for doubtful accounts	0	0
Less total allowance for doubtful accounts	(1,044)	(2,378)
Current accounts receivable, net of allowance for doubtful accounts	4,439	6,623
Long-term accounts receivable, net of allowance for doubtful accounts	0	0
Total accounts receivable, net of allowance for doubtful accounts	$ 4,439	$ 6,623