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Deferred Revenue - Summary of Deferred Revenue (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deferred Revenue Arrangement [Line Items]
Total deferred revenue	$ 35,688us-gaap_DeferredRevenue	$ 20,219us-gaap_DeferredRevenue
Current portion of deferred revenue	14,020us-gaap_DeferredRevenueCurrent	6,878us-gaap_DeferredRevenueCurrent
Deferred revenue, net of current portion	21,668us-gaap_DeferredRevenueNoncurrent	13,341us-gaap_DeferredRevenueNoncurrent
Warranty
Deferred Revenue Arrangement [Line Items]
Total deferred revenue	21,973	15,889
Current portion of deferred revenue	7,300
AXON services
Deferred Revenue Arrangement [Line Items]
Total deferred revenue	9,286	4,026
Current portion of deferred revenue	5,700
Hardware Equipment
Deferred Revenue Arrangement [Line Items]
Total deferred revenue	4,252	304
Current portion of deferred revenue	900
Other
Deferred Revenue Arrangement [Line Items]
Total deferred revenue	$ 177	$ 0