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Balance Sheet Components - Goodwill (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Jan. 31, 2020
Dec. 31, 2019
Indefinite-lived Intangible Assets [Line Items]      
Goodwill $ 16,399   $ 4,083
S2 Systems Corporation      
Indefinite-lived Intangible Assets [Line Items]      
Goodwill   $ 12,316  
Goodwill acquired during period $ 12,300