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Balance Sheet Components - Additional Information (Details) - USD ($)
 1 Months Ended 3 Months Ended 6 Months Ended
Dec. 31, 2018
Jul. 31, 2020
Jul. 31, 2019
Jul. 31, 2020
Jul. 31, 2019
Jan. 31, 2020
Balance Sheet Components [Line Items]            
Amortization expense   $ 300,000 $ 300,000 $ 652,000 $ 516,000  
Amortization expense for deferred sales commissions   900,000 $ 400,000 1,700,000 $ 800,000  
Impairment loss in relation to deferred commission costs capitalized       0    
Non-cancelable purchase commitments   4,000,000.0   4,000,000.0   $ 4,000,000.0
Global Telecomm Corporation            
Balance Sheet Components [Line Items]            
Inventory prepayments   300,000   300,000   500,000
Non-cancelable purchase commitments   $ 400,000   $ 400,000   $ 2,200,000
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%