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Business Acquisitions - Breon Enterprises Acquisition (Details) - USD ($)
$ in Thousands
Jul. 01, 2017
Dec. 31, 2018
Dec. 31, 2017
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]      
Goodwill   $ 24,981 $ 14,927
Breon Enterprises      
Business Acquisition [Line Items]      
Total purchase price $ 4,200    
Increase (decrease) in accounts receivable $ 2,200    
Intangible assets, weighted average useful life 2 years 1 month 6 days    
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]      
Goodwill $ 1,650    
Total purchase price 4,150    
TASER      
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]      
Goodwill   1,338 1,453
TASER | Breon Enterprises      
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]      
Goodwill 800    
Software and Sensors      
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]      
Goodwill   $ 23,643 $ 13,474
Software and Sensors | Breon Enterprises      
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]      
Goodwill 800    
Re-acquired distribution rights | Breon Enterprises      
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]      
Intangible assets other than goodwill acquired 2,100    
Customer relationships | Breon Enterprises      
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]      
Intangible assets other than goodwill acquired $ 400