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Stock-Based Compensation - Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Stock-based compensation |  |  |  |
Unrecognized compensation cost | $ 2,287 |  | $ 2,287 |
RSUs |  |  |  |
Stock-based compensation |  |  |  |
Unrecognized compensation cost | 1,095 |  | 1,095 |
RSAs |  |  |  |
Stock-based compensation |  |  |  |
Unrecognized compensation cost | 1,192 |  | 1,192 |
General and administrative |  |  |  |
Stock-based compensation |  |  |  |
Total stock-based compensation expense | $ 474 | $ 1,452 | $ 1,079 | $ 3,621

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