Goodwill and Intangible Assets - Schedule of Goodwill (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($)
Goodwill [Roll Forward]
Balance, beginning of period	$ 14,927
Goodwill acquired	9,870
Foreign currency translation adjustment	(113)
Balance, end of period	24,684
TASER Weapons
Goodwill [Roll Forward]
Balance, beginning of period	1,453
Goodwill acquired	0
Foreign currency translation adjustment	(56)
Balance, end of period	1,397
Software and Sensors
Goodwill [Roll Forward]
Balance, beginning of period	13,474
Goodwill acquired	9,870
Foreign currency translation adjustment	(57)
Balance, end of period	$ 23,287