Stockholders' Equity - Summary of Stock-based Compensation Expense Recognized (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2017 |
Sep. 30, 2016 |
Sep. 30, 2017 |
Sep. 30, 2016 |
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| Stock-based compensation expense by type of award: | ||||
| Stock-based compensation expense | $ 2,523 | $ 1,953 | $ 6,630 | $ 5,404 |
| Stock Option Plan Awards | ||||
| Stock-based compensation expense by type of award: | ||||
| Stock-based compensation expense | 2,012 | 1,858 | 5,811 | 5,063 |
| Restricted stock units and restricted stock awards | ||||
| Stock-based compensation expense by type of award: | ||||
| Stock-based compensation expense | 402 | 450 | ||
| Employee Stock Purchase Plan | ||||
| Stock-based compensation expense by type of award: | ||||
| Stock-based compensation expense | $ 109 | $ 95 | $ 369 | $ 341 |
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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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