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Property and Equipment, Net - Schedule of Property and Equipment (Detail) - USD ($)
$ in Thousands
Apr. 30, 2018
Jan. 31, 2018
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 17,209 $ 16,381
Less: accumulated depreciation and amortization (10,564) (9,932)
Total property and equipment, net 6,645 6,449
Computer equipment and software [Member]    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 8,895 8,611
Machinery and equipment [Member]    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 4,884 4,761
Furniture and fixtures [Member]    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 933 917
Leasehold improvements [Member]    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 2,151 2,092
Construction in progress [Member]    
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 346 $ 0