Quarterly report pursuant to Section 13 or 15(d)

Segment Information and Geographic Information - Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area (Parenthetical) (Detail)

v3.20.2
Segment Information and Geographic Information - Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area (Parenthetical) (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 31, 2020
Jul. 31, 2019
Jul. 31, 2020
Jul. 31, 2019
Segment Reporting Information [Line Items]        
Total revenues $ 4,995 $ 18,812 $ 11,910 $ 27,297
United States Revenue [Member]        
Segment Reporting Information [Line Items]        
Total revenues $ 1,662 $ 9,666 $ 4,005 $ 13,064
Total Revenue [Member] | Customer Concentration Risk [Member] | United States Revenue [Member]        
Segment Reporting Information [Line Items]        
% of total revenue 33.00% 51.00% 34.00% 48.00%