Segment Information, Significant Customers and Geographic Information - Additional Information (Detail) |
3 Months Ended | |
|---|---|---|
|
Apr. 30, 2017
Segment
Customer
|
Apr. 30, 2016 |
|
| Segment Reporting Information [Line Items] | ||
| Number of reportable segment | Segment | 1 | |
| Total Revenues [Member] | ||
| Segment Reporting Information [Line Items] | ||
| Number of customers accounted | Customer | 1 | |
| Total Revenues [Member] | Customer Concentration Risk [Member] | ||
| Segment Reporting Information [Line Items] | ||
| Concentration risk percentage | 28.00% | 32.00% |