Revenues - Additional Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) source day	Jun. 30, 2017 USD ($)	Jan. 01, 2018 USD ($)	Dec. 31, 2017 USD ($)
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Retained earnings (accumulated deficit)	$ 163,590		$ 163,590		$ 142,179	$ 123,185
Revenue from contract with customers	99,226	$ 79,643	200,441	$ 158,885
Sales, general and administrative	(39,343)	(31,824)	$ (75,102)	(62,681)
Number of revenue sources | source			2
Payment due date from date of invoice | day			30
Revenue, remaining performance obligation	750,000		$ 750,000
Amortization of deferred sales commissions	1,200		2,300
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 customers	600		2,300
Sales, general and administrative	900		1,600
Taser 60 Plan
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from contract with customers	10,200	5,300	24,200	13,300
Interest income (expense), net	$ 300	$ 200	$ 600	$ 300
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%		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%		20.00%
Revenue, remaining performance obligation, expected timing of satisfaction, period			7 years