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Fair Value Measurements (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Oct. 05, 2015
Mar. 31, 2021
Jun. 30, 2020
Jun. 30, 2019
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]                    
Payment for contingent consideration         $ 5,772 $ (128)        
Fair Value, Inputs, Level 3                    
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]                    
Contingent consideration fair value   $ 8,000     8,000 $ 10,379 $ 10,000 $ 4,228 $ 14,766 $ 5,407
Contingent Consideration | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1                    
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]                    
Contingent consideration fair value   0     0     0    
Contingent Consideration | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2                    
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]                    
Contingent consideration fair value   0     0     0    
Contingent Consideration | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3                    
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]                    
Contingent consideration fair value   8,000     $ 8,000     4,228    
Bluenica Corporation                    
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]                    
Earn-out payment installment period 4 years                  
Bluenica Corporation | Contingent Consideration                    
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]                    
Payment for contingent consideration     $ 2,900              
Accelerated | Contingent Consideration                    
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]                    
Payment for contingent consideration     2,400 $ 3,500            
Opengear | Contingent Consideration                    
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]                    
Payment for contingent consideration   10,000 $ 900              
Haxiot | Fair Value, Inputs, Level 3 | Maximum                    
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]                    
Fair value inputs probability of payment         100.00%          
Estimate of Fair Value Measurement | Contingent Consideration | Fair Value, Measurements, Recurring                    
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]                    
Contingent consideration fair value   8,000     $ 8,000     $ 4,228    
Estimate of Fair Value Measurement | Haxiot | Contingent Consideration | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3                    
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]                    
Contingent consideration fair value   $ 8,000     $ 8,000