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Balance Sheet Components - Additional Information (Details) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended
Dec. 31, 2018
Oct. 31, 2019
Oct. 31, 2018
Oct. 31, 2019
Oct. 31, 2018
Jan. 31, 2019
Balance Sheet Components [Line Items]            
Amortization expense for deferred sales commissions   $ 600,000 $ 200,000 $ 1,400,000 $ 400,000  
Impairment loss in relation to deferred commission costs capitalized       0    
Non-cancelable purchase commitments   5,400,000   5,400,000   $ 4,200,000
Global Telecomm Corporation            
Balance Sheet Components [Line Items]            
Procured raw material from related party   500,000   900,000    
Prepaid inventory deposits   500,000   500,000   0
Non-cancelable purchase commitments   $ 2,200,000   $ 2,200,000   $ 0
Global Telecomm Corporation | Convertible Promissory Note            
Balance Sheet Components [Line Items]            
Investment in privately-held company $ 1,300,000          
Convertible promissory note, maturity period 18 months          
Convertible promissory note, interest rate 10.00%          
Customer relationships            
Balance Sheet Components [Line Items]            
Estimated life (in years)       5 years