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Fair Value Measurements (Details) - USD ($)
3 Months Ended 51 Months Ended
Oct. 05, 2015
Dec. 31, 2019
Jun. 30, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 13, 2019
Sep. 30, 2019
Sep. 30, 2018
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]                
Payment for contingent consideration   $ 259,000   $ 243,000        
Fair Value, Inputs, Level 3                
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]                
Contingent consideration fair value   14,766,000   $ 10,147,000 $ 14,766,000   $ 5,407,000 $ 10,065,000
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   $ 14,766,000     14,766,000   5,407,000  
Bluenica Corporation                
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]                
Earn-out payment installment period 4 years              
Bluenica Corporation | Maximum | Fair Value, Inputs, Level 3                
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]                
Fair value inputs probability of payment   100.00%            
Bluenica Corporation | Contingent Consideration                
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]                
Payment for contingent consideration         2,700,000      
TempAlert | Maximum | Fair Value, Inputs, Level 3                
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]                
Fair value inputs probability of payment   0.00%            
Accelerated | Maximum | Fair Value, Inputs, Level 3                
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]                
Fair value inputs probability of payment   100.00%            
Accelerated | Contingent Consideration                
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]                
Payment for contingent consideration     $ 3,500,000          
Opengear | Maximum | Fair Value, Inputs, Level 3                
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]                
Fair value inputs probability of payment   64.00%            
Estimate of Fair Value Measurement | Contingent Consideration | Fair Value, Measurements, Recurring                
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]                
Contingent consideration fair value   $ 14,766,000     14,766,000   $ 5,407,000  
Estimate of Fair Value Measurement | Bluenica Corporation | Contingent Consideration | Fair Value, Measurements, Recurring                
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]                
Contingent consideration fair value   3,300,000     3,300,000      
Estimate of Fair Value Measurement | TempAlert | Contingent Consideration | Fair Value, Measurements, Recurring                
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]                
Contingent consideration fair value   0     0      
Estimate of Fair Value Measurement | Accelerated | Contingent Consideration | Fair Value, Measurements, Recurring                
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]                
Contingent consideration fair value   2,300,000     2,300,000      
Estimate of Fair Value Measurement | Opengear | Contingent Consideration | Fair Value, Measurements, Recurring                
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]                
Contingent consideration fair value   $ 9,100,000     $ 9,100,000 $ 9,100,000