Stock-Based Payments - Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
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Jun. 30, 2016 |
Jun. 30, 2015 |
Jun. 30, 2016 |
Jun. 30, 2015 |
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| Stock-based compensation expense for stock options and restricted common stock granted | ||||
| Stock-based compensation expense | $ 1,148 | $ 613 | $ 1,810 | $ 1,124 |
| Unrecognized compensation cost related to non-vested stock options and unvested restricted common stock | 8,100 | $ 8,100 | ||
| Weighted average period over which future compensation cost is expected to be recognized | 2 years 10 months 24 days | |||
| Research and development | ||||
| Stock-based compensation expense for stock options and restricted common stock granted | ||||
| Stock-based compensation expense | 929 | 535 | $ 1,489 | 997 |
| General and administrative | ||||
| Stock-based compensation expense for stock options and restricted common stock granted | ||||
| Stock-based compensation expense | $ 219 | $ 78 | $ 321 | $ 127 |
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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 Unrecognized cost of unvested share-based compensation awards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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