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Property and Equipment (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Property and equipment, gross | $ 11,731 us-gaap_PropertyPlantAndEquipmentGross | $ 10,786 us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation and amortization | (9,692)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment | (8,961)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property and equipment, net | 2,039 us-gaap_PropertyPlantAndEquipmentNet | 1,825 us-gaap_PropertyPlantAndEquipmentNet
Depreciation expense | 761 us-gaap_DepreciationDepletionAndAmortization | 780 us-gaap_DepreciationDepletionAndAmortization
Minimum |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Property and equipment, useful life | 2 years |
Maximum |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Property and equipment, useful life | 10 years |
Office furniture and equipment |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Property and equipment, gross | 7,234 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_FurnitureAndFixturesMember | 6,676 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_FurnitureAndFixturesMember
Office furniture and equipment | Minimum |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Property and equipment, useful life | 3 years |
Office furniture and equipment | Maximum |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Property and equipment, useful life | 10 years |
Leasehold improvements |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Property and equipment, gross | 1,474 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LeaseholdImprovementsMember | 1,429 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LeaseholdImprovementsMember
Leasehold improvements | Minimum |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Property and equipment, useful life | 1 year |
Leasehold improvements | Maximum |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Property and equipment, useful life | 6 years |
Manufacturing and test equipment |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Property and equipment, gross | $ 3,023 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_MachineryAndEquipmentMember | $ 2,681 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_MachineryAndEquipmentMember
Manufacturing and test equipment | Minimum |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Property and equipment, useful life | 2 years |
Manufacturing and test equipment | Maximum |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |
Property and equipment, useful life | 10 years |

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- 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 -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 14 -Article 5 + Details
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- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition 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 -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition 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 -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph a -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 7 + Details
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- Definition 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 No definition available. + Details
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