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Fair Value Measurements (Details) - USD ($)
3 Months Ended 12 Months Ended
Oct. 05, 2015
Jun. 30, 2020
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Jan. 22, 2018
Nov. 01, 2016
Estimate of Fair Value Measurement | Contingent consideration on acquired business | Fair Value, Measurements, Recurring                  
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]                  
Contingent consideration fair value     $ 4,228,000   $ 5,407,000        
Estimate of Fair Value Measurement | Bluenica Corporation | Contingent consideration on acquired business | Fair Value, Measurements, Recurring                  
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]                  
Contingent consideration fair value $ 10,400,000                
Estimate of Fair Value Measurement | FreshTemp | Contingent consideration on acquired business | Fair Value, Measurements, Recurring                  
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]                  
Contingent consideration fair value                 $ 1,300,000
Estimate of Fair Value Measurement | TempAlert | Contingent consideration on acquired business | Fair Value, Measurements, Recurring                  
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]                  
Contingent consideration fair value     0            
Estimate of Fair Value Measurement | Accelerated Concepts | Contingent consideration on acquired business | Fair Value, Measurements, Recurring                  
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]                  
Contingent consideration fair value               $ 2,300,000  
Estimate of Fair Value Measurement | Opengear | Contingent consideration on acquired business | Fair Value, Measurements, Recurring                  
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]                  
Contingent consideration fair value     4,200,000            
Change in fair value of contingent consideration     (128,000)   1,190,000 $ 1,377,000      
Fair Value, Inputs, Level 3                  
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]                  
Contingent consideration fair value     4,228,000   5,407,000 10,065,000      
Contingent consideration on acquired business | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3                  
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]                  
Contingent consideration fair value     4,228,000   5,407,000        
Bluenica Corporation                  
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]                  
Business Combination, Contingent Liability, Payout Period 4 years                
Bluenica Corporation | Contingent consideration on acquired business                  
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]                  
Change in fair value of contingent consideration     $ 2,900,000   2,200,000 $ 0 $ 500,000    
FreshTemp | Contingent consideration on acquired business                  
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]                  
Change in fair value of contingent consideration         200,000        
TempAlert | Contingent consideration on acquired business                  
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]                  
Change in fair value of contingent consideration       $ 0          
Accelerated Concepts | Contingent consideration on acquired business                  
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]                  
Change in fair value of contingent consideration   $ 2,400,000     $ 3,500,000        
Opengear | Maximum | Fair Value, Inputs, Level 3                  
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]                  
Fair value inputs probability of payment     72.00%            
Opengear | Contingent consideration on acquired business                  
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]                  
Change in fair value of contingent consideration   $ 900,000