Stock-Based Payments - Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands |
3 Months Ended | |
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Mar. 31, 2017 |
Mar. 31, 2016 |
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| Stock-based compensation expense for stock options and restricted common stock granted | ||
| Stock-based compensation expense | $ 884 | $ 662 |
| Unrecognized compensation cost related to non-vested stock options granted to employees | $ 13,000 | |
| Weighted average period over which future compensation cost is expected to be recognized for awards granted to employees | 3 years 1 month 6 days | |
| Unrecognized compensation cost related to non-vested stock options granted to non-employees | $ 1,000 | |
| Research and development | ||
| Stock-based compensation expense for stock options and restricted common stock granted | ||
| Stock-based compensation expense | 330 | 560 |
| General and administrative | ||
| Stock-based compensation expense for stock options and restricted common stock granted | ||
| Stock-based compensation expense | $ 554 | $ 102 |
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- Definition Unrecognized cost of unvested share-based compensation awards related to nonemployee services. No definition available.
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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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