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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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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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.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Condensed consolidated financial statement details - Property and Equipment, Net (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Gross property and equipment	$ 136,305	$ 155,220,000
Less: Accumulated depreciation and amortization	(112,594)	(118,681,000)
Property and equipment, net	23,711,000	36,539,000
Depreciation	14,500,000	18,500,000	$ 23,600,000
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment	35,180	50,736,000
Production, engineering and other equipment [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment	48,908	45,649,000
Tooling [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment	17,635	19,216,000
Computers and software [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment	22,385	21,719,000
Furniture and office equipment [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment	6,315	10,846,000
Tradeshow Equipment and other [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment	5,860	7,009,000
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment	$ 22	$ 45,000