Balance Sheet Components - Schedule of Property and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 23,727	$ 18,185
Less: accumulated depreciation and amortization	(12,167)	(10,879)
Property and equipment, net	11,560	7,306
Prototype
Property Plant And Equipment [Line Items]
Property and equipment, gross	6,405	6,492
Machine and Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	5,807	7,128
Leasehold Improvements
Property Plant And Equipment [Line Items]
Property and equipment, gross	4,621	1,532
Furniture and Fixtures
Property Plant And Equipment [Line Items]
Property and equipment, gross	368	350
Software
Property Plant And Equipment [Line Items]
Property and equipment, gross	1,028	832
Construction In Progress
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 5,498	$ 1,851

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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-Publisher FASB
-Name Accounting Standards Codification
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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

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