Stockholders' Equity - Summary of Stock-based Compensation Expense Recognized (Details) - USD ($) $ in Thousands |
3 Months Ended | |
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Mar. 31, 2018 |
Mar. 31, 2017 |
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| Stock-based compensation expense by type of award: | ||
| Stock-based compensation expense | $ 3,381 | $ 1,891 |
| Stock Option Plan Awards | ||
| Stock-based compensation expense by type of award: | ||
| Stock-based compensation expense | 1,951 | 1,744 |
| Restricted stock units and restricted stock awards | ||
| Stock-based compensation expense by type of award: | ||
| Stock-based compensation expense | 1,239 | 24 |
| Employee Stock Purchase Plan | ||
| Stock-based compensation expense by type of award: | ||
| Stock-based compensation expense | $ 191 | $ 123 |
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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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