Quarterly report pursuant to Section 13 or 15(d)

Consolidated Balance Sheet Detail - Additional Information (Detail)

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Consolidated Balance Sheet Detail - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Oct. 31, 2017
Oct. 31, 2016
Oct. 31, 2017
Oct. 31, 2016
Jan. 31, 2017
Sep. 30, 2016
Aug. 31, 2016
Balance Sheet Related Disclosures [Abstract]              
Depreciation and amortization expense $ 600 $ 700 $ 1,758 $ 2,289      
Assets held for sale           $ 200 $ 300
Loss on impairment of long-lived assets held for sale   $ 100   $ 100 $ 300