Quarterly report pursuant to Section 13 or 15(d)

Nature of Business and Basis of Presentation - Schedule of Effect of Change in Methodology (Detail)

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Nature of Business and Basis of Presentation - Schedule of Effect of Change in Methodology (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Oct. 31, 2017
Oct. 31, 2016
Oct. 31, 2017
Oct. 31, 2016
Nature Of Business And Basis Of Presentation [Line Items]        
Cost of revenues - service $ 5,612 $ 7,470 $ 15,810 $ 26,336
Selling and marketing expenses $ 3,916 3,988 $ 9,292 12,487
As Filed Fiscal 2017 [Member]        
Nature Of Business And Basis Of Presentation [Line Items]        
Cost of revenues - service   8,036   27,982
Selling and marketing expenses   3,422   10,841
Adjustment to Conform to Current Year Presentation [Member]        
Nature Of Business And Basis Of Presentation [Line Items]        
Cost of revenues - service   (566)   (1,646)
Selling and marketing expenses   $ 566   $ 1,646