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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
Cost of revenue |  |
Stock-based compensation | $ 7 | $ 0
Research and development |  |
Stock-based compensation | 1,311 | 1,876
Marketing, general and administrative |  |
Stock-based compensation | $ 1,581 | $ 3,072

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