Goodwill and Intangible Assets - Schedule of Goodwill (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
Goodwill [Roll Forward]
Balance, beginning of period	$ 14,927
Foreign currency translation adjustment	20
Balance, end of period	14,947
TASER Weapons
Goodwill [Roll Forward]
Balance, beginning of period	1,453
Foreign currency translation adjustment	10
Balance, end of period	1,463
Software and Sensors
Goodwill [Roll Forward]
Balance, beginning of period	13,474
Foreign currency translation adjustment	10
Balance, end of period	$ 13,484