Balance Sheet - Accounts Receivable (Detail) - USD ($) $ in Thousands	Oct. 31, 2019	Jan. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Current accounts receivable	$ 15,016	$ 14,195
Long-term accounts receivable	0	712
Accounts receivable	15,016	14,907
Less current portion of allowance for doubtful accounts	(2,069)	(2,113)
Less long-term portion of allowance for doubtful accounts	0	0
Less total allowance for doubtful accounts	(2,069)	(2,113)
Current accounts receivable, net of allowance for doubtful accounts	12,947	12,082
Long-term accounts receivable, net of allowance for doubtful accounts	0	712
Total accounts receivable, net of allowance for doubtful accounts	$ 12,947	$ 12,794