Stockholders' Equity - Summary of Stock-based Compensation Expense Recognized (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
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Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2016 |
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Stock-based compensation expense by type of award: | |||
Stock-based compensation expense | $ 12,790 | $ 9,640 | $ 7,294 |
Stock Option Plan Awards | |||
Stock-based compensation expense by type of award: | |||
Stock-based compensation expense | 6,015 | 7,652 | 6,850 |
Restricted stock units and restricted stock awards | |||
Stock-based compensation expense by type of award: | |||
Stock-based compensation expense | 5,890 | 1,447 | |
Employee Stock Purchase Plan | |||
Stock-based compensation expense by type of award: | |||
Stock-based compensation expense | $ 885 | $ 541 | $ 444 |
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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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- References No definition available.
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