Revenues - Additional Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) source day	Mar. 31, 2017 USD ($)	Jan. 01, 2018 USD ($)	Dec. 31, 2017 USD ($)
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Retained earnings (accumulated deficit)	$ 155,105		$ 142,179	$ 123,185
Revenue from contract with customer, excluding assessed tax	101,215	$ 79,242
Sales, general and administrative	$ 35,759	30,857
Number of revenue sources | source	2
Payment due date from date of invoice | day	30
Revenue, remaining performance obligation	$ 650,000
Amortization of deferred sales commissions	1,100
Impact of Adoption of Topic 606 on Opening Balance Sheet | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Retained earnings (accumulated deficit)			$ 18,994	$ 19,000
Revenue from contract with customer, excluding assessed tax	1,700
Sales, general and administrative	(500)
Taser 60 Plan
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from contract with customer, excluding assessed tax	14,000	8,100
Interest income (expense), net	$ 300	$ 100
Minimum
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue, remaining performance obligation to be recognized in the next twelve months, percent	15.00%
Revenue, remaining performance obligation, expected timing of satisfaction, period	5 years
Maximum
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue, remaining performance obligation to be recognized in the next twelve months, percent	20.00%
Revenue, remaining performance obligation, expected timing of satisfaction, period	7 years