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Consolidated Balance Sheets and Statements of Operations and Comprehensive Loss Components (Details 2) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013
Intangible assets |  |
Gross Carrying Amount | 10,020,000 us-gaap_FiniteLivedIntangibleAssetsGross | 10,020,000 us-gaap_FiniteLivedIntangibleAssetsGross
Accumulated Amortization | 9,365,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization | 8,365,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Net Carrying Value | 655,000 us-gaap_IntangibleAssetsNetExcludingGoodwill | 1,655,000 us-gaap_IntangibleAssetsNetExcludingGoodwill
Estimated aggregate amortization expense to be recognized in future |  |
2015 | 300,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths |
2016 | 100,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo |
2017 | 100,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree |
2018 | 100,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour |
Minimum |  |
Intangible assets |  |
Life | 3 years |
Maximum |  |
Intangible assets |  |
Life | 7 years |
Developed technology |  |
Intangible assets |  |
Life |  | 3 years
Gross Carrying Amount | 9,240,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember | 9,240,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember
Accumulated Amortization | 9,031,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember | 8,142,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember
Net Carrying Value | 209,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember | 1,098,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember
Developed technology | Minimum |  |
Intangible assets |  |
Life | 3 years |
Developed technology | Maximum |  |
Intangible assets |  |
Life | 5 years | 5 years
Patent license |  |
Intangible assets |  |
Life | 7 years | 7 years
Gross Carrying Amount | 780,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember | 780,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember
Accumulated Amortization | 334,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember | 223,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember
Net Carrying Value | 446,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember | 557,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember

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