Balance Sheet - Accounts Receivable (Detail) - USD ($) $ in Thousands	Jul. 31, 2019	Jan. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Current accounts receivable	$ 12,722	$ 14,195
Long-term accounts receivable	90	712
Accounts receivable	12,812	14,907
Less current portion of allowance for doubtful accounts	(2,073)	(2,113)
Less long-term portion of allowance for doubtful accounts	0	0
Less total allowance for doubtful accounts	(2,073)	(2,113)
Current accounts receivable, net of allowance for doubtful accounts	10,649	12,082
Long-term accounts receivable, net of allowance for doubtful accounts	90	712
Total accounts receivable, net of allowance for doubtful accounts	$ 10,739	$ 12,794