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Consolidated Balance Sheets and Statements of Operations and Comprehensive Loss Components - Developed Technology/Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Intangible assets
Gross Carrying Amount	$ 10,020	$ 10,020
Accumulated Amortization	9,686	9,365
Net Carrying Value	334	655
Estimated aggregate amortization expense to be recognized in future
2016	100
2017	100
2018	$ 100
Minimum
Intangible assets
Life	3 years
Maximum
Intangible assets
Life	7 years
Developed technology
Intangible assets
Gross Carrying Amount	$ 9,240	9,240
Accumulated Amortization	$ 9,240	9,031
Net Carrying Value		$ 209
Developed technology | Minimum
Intangible assets
Life	3 years	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	$ 780
Accumulated Amortization	446	334
Net Carrying Value	$ 334	$ 446

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- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
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+ References

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