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Business Combination - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 01, 2019
Jun. 30, 2019
Jun. 30, 2019
Business Acquisition [Line Items]      
Vesting period     4 years
NetFort Technologies [Member]      
Business Acquisition [Line Items]      
Total cash consideration $ 16.1    
Acquisition related costs   $ 0.3 $ 0.5
Deferred tax benefit recognized during period for release of valuation allowance $ 0.8    
Vesting period 3 years    
Restricted Stock Units (RSUs) [Member] | NetFort Technologies [Member]      
Business Acquisition [Line Items]      
Equity awards granted to certain retained employees (in shares) 123,623