Quarterly report pursuant to Section 13 or 15(d)

Consolidated Balance Sheet Detail - Additional Information (Detail)

v3.10.0.1
Consolidated Balance Sheet Detail - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Oct. 31, 2018
Oct. 31, 2017
Oct. 31, 2018
Oct. 31, 2017
Balance Sheet Related Disclosures [Abstract]        
Depreciation and amortization expense $ 300 $ 600 $ 1,053 $ 1,758