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Basis of Presentation (Details 5) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Basis of Presentation [Line Items] |  |  |
Share-based compensation expense | $ 5,666 | $ 4,067 | $ 3,351
Research and development expenses |  |  |
Basis of Presentation [Line Items] |  |  |
Share-based compensation expense | 1,705 | 1,448 | 1,072
General and administrative expenses |  |  |
Basis of Presentation [Line Items] |  |  |
Share-based compensation expense | $ 3,961 | $ 2,619 | $ 2,279

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- Details
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Data Type: | xbrli:stringItemType
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- Definition The amount of expense, net of income tax, recognized during the period arising from equity-based compensation arrangements (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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Balance Type: | debit
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