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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	10,020,000us-gaap_FiniteLivedIntangibleAssetsGross	10,020,000us-gaap_FiniteLivedIntangibleAssetsGross
Accumulated Amortization	9,365,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization	8,365,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Net Carrying Value	655,000us-gaap_IntangibleAssetsNetExcludingGoodwill	1,655,000us-gaap_IntangibleAssetsNetExcludingGoodwill
Estimated aggregate amortization expense to be recognized in future
2015	300,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
2016	100,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
2017	100,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
2018	100,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
Minimum
Intangible assets
Life	3 years
Maximum
Intangible assets
Life	7 years
Developed technology
Intangible assets
Life		3 years
Gross Carrying Amount	9,240,000us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember	9,240,000us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember
Accumulated Amortization	9,031,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember	8,142,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember
Net Carrying Value	209,000us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember	1,098,000us-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	780,000us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember	780,000us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember
Accumulated Amortization	334,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember	223,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember
Net Carrying Value	446,000us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember	557,000us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember

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