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Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property and equipment at cost	$ 4,690	$ 5,258
Less: accumulated depreciation	(2,365)	(2,829)
Property and equipment, net	2,325	2,429
Depreciation	805	266	$ 184
Impairment loss on equipment and software	$ 857
Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	2 years
Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	15 years
Equipment
Property, Plant and Equipment [Line Items]
Property and equipment at cost	$ 2,231	$ 2,864
Equipment | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	3 years	3 years
Equipment | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	15 years	15 years
Tooling
Property, Plant and Equipment [Line Items]
Property and equipment at cost	$ 863	$ 851
Tooling | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	2 years	2 years
Tooling | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	5 years	5 years
Vehicles
Property, Plant and Equipment [Line Items]
Property and equipment at cost	$ 39	$ 39
Property and equipment, useful life	5 years	5 years
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment at cost	$ 170	$ 104
Property and equipment, useful life	5 years	5 years
Computer software
Property, Plant and Equipment [Line Items]
Property and equipment at cost	$ 977	$ 581
Property and equipment, useful life	3 years	3 years
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment at cost	$ 256	$ 509
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment at cost	$ 154	$ 310

X

- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

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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The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

+ References

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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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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

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