5. Fixed assets (Details) - Fixed Asset Components (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Fixed Asset Components [Abstract]
Tooling, machinery and equipment	$ 10,620us-gaap_MachineryAndEquipmentGross	$ 12,066us-gaap_MachineryAndEquipmentGross
Furniture and office equipment	1,489us-gaap_FurnitureAndFixturesGross	1,492us-gaap_FurnitureAndFixturesGross
Computer software and equipment	6,132	5,986
Leasehold improvements	1,952us-gaap_LeaseholdImprovementsGross	1,926us-gaap_LeaseholdImprovementsGross
	20,193us-gaap_PropertyPlantAndEquipmentGross	21,470us-gaap_PropertyPlantAndEquipmentGross
Less: Accumulated depreciation and amortization	(17,858)	(18,989)
	2,335	2,481
Construction in-process	103us-gaap_ConstructionInProgressGross	251us-gaap_ConstructionInProgressGross
	$ 2,438us-gaap_PropertyPlantAndEquipmentNet	$ 2,732us-gaap_PropertyPlantAndEquipmentNet

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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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-SubTopic 10

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- Definition

Amount before accumulated amortization of capitalized costs for computer software, including but not limited to, acquired and internally developed computer software.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 985

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-Paragraph 1

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- Definition

Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service.

+ References

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- Definition

Amount before accumulated depreciation of equipment commonly used in offices and stores that have no permanent connection to the structure of a building or utilities. Examples include, but are not limited to, desks, chairs, tables, and bookcases.

+ References

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- Definition

Amount before accumulated depreciation of additions or improvements to assets held under a lease arrangement.

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- Definition

Amount before accumulated depreciation of tangible personal property used to produce goods and services, including, but is not limited to, tools, dies and molds, computer and office equipment.

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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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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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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- Definition

The net amount of capitalized assets classified as property, plant and equipment not otherwise defined in the taxonomy.

+ References

No definition available.

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