Revenues - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended								9 Months Ended	12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Unbilled Receivables, Current	$ 17,300									$ 17,300
Payment due date from date of invoice									30 days
Retained earnings	171,383				$ 123,185					171,383	$ 123,185		$ 142,179
Net sales	114,791	$ 104,836	$ 99,226	$ 101,215	$ 94,651	$ 90,262	$ 79,643	$ 79,242		420,068	343,798	$ 268,245
Sales, general and administrative										156,886	138,692	$ 108,076
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	$ 19,000									19,000			$ 18,994
Net sales										5,000
Sales, general and administrative										(3,600)
Taser 60 Plan
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net sales										48,200	40,700
Interest Income (Expense), Net										1,300	$ 700
Sales, general and administrative expenses
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Amortization related to deferred commissions										$ 5,300
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%
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%