Goodwill and Intangible Assets - Schedule of Goodwill (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2018 USD ($)
Goodwill [Roll Forward]
Balance, beginning of period	$ 14,927
Goodwill acquired	10,285
Foreign currency translation adjustment	(169)
Balance, end of period	25,043
TASER Weapons
Goodwill [Roll Forward]
Balance, beginning of period	1,453
Goodwill acquired	0
Foreign currency translation adjustment	(84)
Balance, end of period	1,369
Software and Sensors
Goodwill [Roll Forward]
Balance, beginning of period	13,474
Goodwill acquired	10,285
Foreign currency translation adjustment	(85)
Balance, end of period	$ 23,674