Goodwill and Intangible Assets - Changes in Carrying Amount of Goodwill (Detail) $ in Thousands	12 Months Ended
Dec. 31, 2019 USD ($)
Changes in carrying amount of goodwill
Balance, December 31, 2018	$ 24,981
Foreign currency translation adjustments	32
Balance, December 31, 2019	25,013
TASER
Changes in carrying amount of goodwill
Balance, December 31, 2018	1,338
Foreign currency translation adjustments	16
Balance, December 31, 2019	1,354
Software and Sensors
Changes in carrying amount of goodwill
Balance, December 31, 2018	23,643
Foreign currency translation adjustments	16
Balance, December 31, 2019	$ 23,659

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

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- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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