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CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Cost of revenue |  |  |
Stock-based compensation | $ 56 | $ 63 | $ 44
Research and development |  |  |
Stock-based compensation | 9,165 | 6,762 | 7,216
Sales, general and administrative |  |  |
Stock-based compensation | $ 11,792 | $ 8,271 | $ 7,470

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