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Stock-Based Compensation - Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Stock-based compensation |  |  |  |
Unrecognized compensation cost | $ 1,800 |  | $ 1,800 |
Market-based awards and service-based awards | Senior Management |  |  |  |
Stock-based compensation |  |  |  |
Stock based compensation reversed |  | $ 1,900 |  |
RSUs |  |  |  |
Stock-based compensation |  |  |  |
Unrecognized compensation cost | 733 |  | 733 |
RSAs |  |  |  |
Stock-based compensation |  |  |  |
Unrecognized compensation cost | 1,067 |  | 1,067 |
General and administrative |  |  |  |
Stock-based compensation |  |  |  |
Total stock-based compensation expense | $ 489 | $ (874) | $ 1,568 | $ 2,747

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