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Restructuring (Details)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
USD ($)
employee
Mar. 31, 2021
USD ($)
employee
Dec. 31, 2020
USD ($)
employee
Mar. 31, 2020
USD ($)
Jun. 30, 2017
USD ($)
employee
Sep. 30, 2018
USD ($)
employee
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2017
USD ($)
Restructuring Reserve [Roll Forward]                    
Restructuring reserve, beginning balance     $ 0       $ 0 $ 0 $ 453  
Restructuring charge             995 133 0  
Payments for restructuring             (935) (117) (359)  
Restructuring reversals             0 (16) (87)  
Restructuring foreign currency fluctuation             60 0 (7)  
Restructuring reserve, ending balance           $ 453 0 0 0  
Employee Termination Costs | 2020 Restructuring                    
Restructuring Reserve [Roll Forward]                    
Restructuring reserve, beginning balance     0       0 0 0  
Restructuring charge             0 133 0  
Payments for restructuring             0 (117) 0  
Restructuring reversals             0 (16) 0  
Restructuring foreign currency fluctuation             0 0 0  
Restructuring reserve, ending balance           0 0 0 0  
Employee Termination Costs | Manufacturing Transition                    
Restructuring Reserve [Roll Forward]                    
Restructuring reserve, beginning balance     0       0 0 147  
Restructuring charge             0 0 0  
Payments for restructuring             0 0 (108)  
Restructuring reversals             0 0 (39)  
Restructuring foreign currency fluctuation             0 0 0  
Restructuring reserve, ending balance           147 0 0 0  
Employee Termination Costs | 2017 Restructuring                    
Restructuring Reserve [Roll Forward]                    
Restructuring reserve, beginning balance     0       0 0 293  
Restructuring charge             0 0 0  
Payments for restructuring             0 0 (233)  
Restructuring reversals             0 0 (53)  
Restructuring foreign currency fluctuation             0 0 (7)  
Restructuring reserve, ending balance           293 0 0 0  
Employee Termination Costs | 2021 Restructuring                    
Restructuring Reserve [Roll Forward]                    
Restructuring reserve, beginning balance     0       0 0 0  
Restructuring charge             995 0 0  
Payments for restructuring             (935) 0 0  
Restructuring reversals             0 0 0  
Restructuring foreign currency fluctuation             60 0 0  
Restructuring reserve, ending balance           0 0 0 0  
Other | 2017 Restructuring                    
Restructuring Reserve [Roll Forward]                    
Restructuring reserve, beginning balance     $ 0       0 0 13  
Restructuring charge             0 0 0  
Payments for restructuring             0 0 (18)  
Restructuring reversals             0 0 5  
Restructuring foreign currency fluctuation             0 0 0  
Restructuring reserve, ending balance           $ 13 $ 0 $ 0 $ 0  
IoT Products & Services | 2020 Restructuring                    
Restructuring Cost and Reserve [Line Items]                    
Number of positions eliminated | employee   2                
IoT Products & Services | Manufacturing Transition                    
Restructuring Cost and Reserve [Line Items]                    
Number of positions eliminated | employee           53        
IoT Products & Services | 2017 Restructuring                    
Restructuring Reserve [Roll Forward]                    
Restructuring charge                   $ 2,500
IoT Products & Services | 2021 Restructuring                    
Restructuring Cost and Reserve [Line Items]                    
Number of positions eliminated | employee     19              
IoT Products & Services | Employee Termination Costs | 2020 Restructuring                    
Restructuring Reserve [Roll Forward]                    
Restructuring charge       $ 38            
IoT Products & Services | Employee Termination Costs | Manufacturing Transition                    
Restructuring Reserve [Roll Forward]                    
Restructuring charge           $ 500        
IoT Products & Services | Employee Termination Costs | 2017 Restructuring                    
Restructuring Reserve [Roll Forward]                    
Restructuring charge         $ 2,300          
IoT Products & Services | Employee Termination Costs | 2021 Restructuring                    
Restructuring Reserve [Roll Forward]                    
Restructuring charge $ 100 $ 200 $ 700              
IoT Products & Services | Contract Termination | 2017 Restructuring                    
Restructuring Reserve [Roll Forward]                    
Restructuring charge         $ 200          
IoT Products & Services | UNITED STATES | 2017 Restructuring                    
Restructuring Cost and Reserve [Line Items]                    
Number of positions eliminated | employee         10          
IoT Products & Services | FRANCE | 2017 Restructuring                    
Restructuring Cost and Reserve [Line Items]                    
Number of positions eliminated | employee         8          
IoT Solutions | 2020 Restructuring                    
Restructuring Cost and Reserve [Line Items]                    
Number of positions eliminated | employee 22                  
IoT Solutions | Employee Termination Costs | 2020 Restructuring                    
Restructuring Reserve [Roll Forward]                    
Restructuring charge $ 95