Stockholders' Equity - Summary of Stock-based Compensation Expense Recognized (Details) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2017 |
Mar. 31, 2016 |
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| Stock-based compensation expense by type of award: | ||
| Stock-based compensation expense | $ 1,891 | $ 1,295 |
| Restricted Stock Units | ||
| Stock-based compensation expense by type of award: | ||
| Stock-based compensation expense | 24 | |
| Employee Stock Purchase Plan | ||
| Stock-based compensation expense by type of award: | ||
| Stock-based compensation expense | 123 | 91 |
| Stock options | ||
| Stock-based compensation expense by type of award: | ||
| Stock-based compensation expense | $ 1,744 | $ 1,204 |
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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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