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Balance Sheet Components - Additional Information (Details) - USD ($)
$ in Thousands
Mar. 12, 2018
Oct. 31, 2018
Jan. 31, 2018
Finite Lived Intangible Assets [Line Items]      
Goodwill   $ 3,803 $ 1,947
Voxter Communications Inc.      
Finite Lived Intangible Assets [Line Items]      
Goodwill $ 1,900    
Intangible assets recognized from acquisition 2,100    
Goodwill recognized from acquisition $ 1,900