Stock-Based Compensation - Stock-based compensation expense (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
---|---|---|---|---|
Sep. 30, 2020 |
Sep. 30, 2019 |
Sep. 30, 2020 |
Sep. 30, 2019 |
|
Stock-Based Compensation | ||||
Stock options | $ 140 | $ 264 | $ 535 | $ 1,231 |
Restricted stock units | 165 | 103 | 640 | 350 |
Total stock-based compensation | $ 305 | $ 367 | $ 1,175 | $ 1,581 |