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Commitments and Contingencies - Letters of Credit (Details) - USD ($)
$ in Millions
Jul. 31, 2019
Apr. 30, 2019
Jan. 31, 2019
Sunnyvale, California      
Letters of Credit      
Unused standby letter of credit $ 0.5 $ 0.5 $ 0.5
Austin, Texas      
Letters of Credit      
Unused standby letter of credit $ 1.0   $ 0.8