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Stock-Based Compensation (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Stock-Based Compensation |  |
Stock-based compensation | $ 1,622 | $ 1,355
Operating expense |  |
Stock-Based Compensation |  |
Stock-based compensation | 2 |
Selling, general and administrative |  |
Stock-Based Compensation |  |
Stock-based compensation | 1,546 | 1,331
Research and development |  |
Stock-Based Compensation |  |
Stock-based compensation | $ 74 | $ 24

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements including reclassifications (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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