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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Cost of revenue |  |  |  |
Stock-based compensation | $ 12 | $ 7 | $ 34 | $ 12
Research and development |  |  |  |
Stock-based compensation | 1,648 | 1,630 | 5,574 | 5,166
Marketing, general and administrative |  |  |  |
Stock-based compensation | $ 1,781 | $ 1,726 | $ 5,587 | $ 6,707

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