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Property and Equipment and Assets Held For Sale (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property and equipment at cost	$ 3,469		$ 3,411
Less: accumulated depreciation	(2,465)		(2,314)
Property and equipment, net	1,004		1,097
Depreciation	151	$ 177
Equipment
Property, Plant and Equipment [Line Items]
Property and equipment at cost	$ 1,577		1,557
Equipment | Minimum
Property, Plant and Equipment [Line Items]
Useful life	3 years
Equipment | Maximum
Property, Plant and Equipment [Line Items]
Useful life	15 years
Tooling
Property, Plant and Equipment [Line Items]
Property and equipment at cost	$ 371		371
Tooling | Minimum
Property, Plant and Equipment [Line Items]
Useful life	2 years
Tooling | Maximum
Property, Plant and Equipment [Line Items]
Useful life	5 years
Vehicles
Property, Plant and Equipment [Line Items]
Useful life	5 years
Property and equipment at cost	$ 47		47
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Useful life	5 years
Property and equipment at cost	$ 137		137
Computer software
Property, Plant and Equipment [Line Items]
Useful life	3 years
Property and equipment at cost	$ 1,043		1,043
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment at cost	210		201
Projects in progress
Property, Plant and Equipment [Line Items]
Property and equipment at cost	$ 84		$ 55

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.14)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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+ References

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Topic 210
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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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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