Stockholders' Equity - Summary of Stock-based Compensation Expense Recognized (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2019 |
Jun. 30, 2018 |
Jun. 30, 2019 |
Jun. 30, 2018 |
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| Stock-based compensation expense by type of award: | ||||
| Stock-based compensation expense | $ 1,779 | $ 3,186 | $ 5,365 | $ 6,567 |
| Stock Option Plan Awards | ||||
| Stock-based compensation expense by type of award: | ||||
| Stock-based compensation expense | 776 | 1,548 | 1,923 | 3,500 |
| Restricted stock units and restricted stock awards | ||||
| Stock-based compensation expense by type of award: | ||||
| Stock-based compensation expense | 791 | 1,416 | 3,048 | 2,654 |
| Employee Stock Purchase Plan | ||||
| Stock-based compensation expense by type of award: | ||||
| Stock-based compensation expense | $ 212 | $ 222 | $ 394 | $ 413 |
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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://fasb.org/us-gaap/role/ref/legacyRef
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