Stock-Based Payments - Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
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Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
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| Stock-based compensation expense for stock options and restricted common stock granted | |||
| Stock-based compensation expense | $ 4,234 | $ 3,233 | $ 937 |
| Unrecognized compensation cost related to non-vested stock options and unvested restricted common stock granted to employees | $ 8,800 | ||
| Weighted average period over which future compensation cost is expected to be recognized for awards granted to employees | 3 years | ||
| Unrecognized compensation cost related to non-vested stock options granted to non-employees | $ 800 | ||
| Research and development | |||
| Stock-based compensation expense for stock options and restricted common stock granted | |||
| Stock-based compensation expense | 2,980 | 2,733 | 830 |
| General and administrative | |||
| Stock-based compensation expense for stock options and restricted common stock granted | |||
| Stock-based compensation expense | $ 1,254 | $ 500 | $ 107 |
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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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