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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