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CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Cost of revenue |  |  |
Stock-based compensation | $ 63 | $ 44 | $ 19
Research and development |  |  |
Stock-based compensation | 6,762 | 7,216 | 6,597
Sales, general and administrative |  |  |
Stock-based compensation | $ 8,271 | $ 7,470 | $ 8,365

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