Stock-based Compensation (Details) - USD ($) |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2016 |
Jun. 30, 2015 |
Jun. 30, 2016 |
Jun. 30, 2015 |
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| Stock-based compensation expense related to stock-based awards | ||||
| Total stock-based compensation expense | $ 2,014,000 | $ 1,909,000 | $ 3,452,000 | $ 3,963,000 |
| Research and development | ||||
| Stock-based compensation expense related to stock-based awards | ||||
| Total stock-based compensation expense | 1,410,000 | 1,056,000 | 2,103,000 | 2,216,000 |
| Incremental stock-based compensation expense | 641,000 | 641,000 | ||
| General and administrative | ||||
| Stock-based compensation expense related to stock-based awards | ||||
| Total stock-based compensation expense | $ 604,000 | $ 853,000 | $ 1,349,000 | $ 1,747,000 |
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- Definition Represents the expense 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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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. No definition available.
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- Definition An excess of the fair value of the modified award over the fair value of the award immediately before the modification. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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