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Deferred Revenue - Summary of Deferred Revenue (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Deferred Revenue Arrangement [Line Items]
Total deferred revenue	$ 37,071us-gaap_DeferredRevenue	$ 35,688us-gaap_DeferredRevenue
Current portion of deferred revenue	14,628us-gaap_DeferredRevenueCurrent	14,020us-gaap_DeferredRevenueCurrent
Deferred revenue, net of current portion	22,443us-gaap_DeferredRevenueNoncurrent	21,668us-gaap_DeferredRevenueNoncurrent
Warranty
Deferred Revenue Arrangement [Line Items]
Total deferred revenue	21,701	21,973
Current portion of deferred revenue	7,300
AXON services
Deferred Revenue Arrangement [Line Items]
Total deferred revenue	9,055	9,286
Current portion of deferred revenue	5,500
Hardware equipment
Deferred Revenue Arrangement [Line Items]
Total deferred revenue	5,988	4,252
Current portion of deferred revenue	1,600
Other
Deferred Revenue Arrangement [Line Items]
Total deferred revenue	$ 327	$ 177