Segment Information, Significant Customers and Geographic Information - Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area (Detail) - USD ($)
$ in Thousands |
3 Months Ended |
Apr. 30, 2017 |
Apr. 30, 2016 |
| Segment Reporting Information [Line Items] |
|
|
| Total revenues |
$ 16,667
|
$ 21,570
|
| North America [Member] |
|
|
| Segment Reporting Information [Line Items] |
|
|
| Total revenues |
8,326
|
10,671
|
| Europe and Middle East [Member] |
|
|
| Segment Reporting Information [Line Items] |
|
|
| Total revenues |
7,165
|
9,141
|
| Latin America [Member] |
|
|
| Segment Reporting Information [Line Items] |
|
|
| Total revenues |
721
|
1,185
|
| Asia Pacific [Member] |
|
|
| Segment Reporting Information [Line Items] |
|
|
| Total revenues |
$ 455
|
$ 573
|
| Customer Concentration Risk [Member] | Total Revenues [Member] |
|
|
| Segment Reporting Information [Line Items] |
|
|
| % of total revenues |
28.00%
|
32.00%
|
| Customer Concentration Risk [Member] | Total Revenues [Member] | North America [Member] |
|
|
| Segment Reporting Information [Line Items] |
|
|
| % of total revenues |
50.00%
|
50.00%
|
| Customer Concentration Risk [Member] | Total Revenues [Member] | Europe and Middle East [Member] |
|
|
| Segment Reporting Information [Line Items] |
|
|
| % of total revenues |
43.00%
|
42.00%
|
| Customer Concentration Risk [Member] | Total Revenues [Member] | Latin America [Member] |
|
|
| Segment Reporting Information [Line Items] |
|
|
| % of total revenues |
4.00%
|
5.00%
|
| Customer Concentration Risk [Member] | Total Revenues [Member] | Asia Pacific [Member] |
|
|
| Segment Reporting Information [Line Items] |
|
|
| % of total revenues |
3.00%
|
3.00%
|