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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. + References No definition available. + Details
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