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Share-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation expense | $ 229 | $ 254 | $ 1,090 | $ 1,047
Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized compensation cost | $ 530 |  | $ 530 |
Expected weighted-average period in years of compensation cost to be recognized |  |  | 1 year 8 months 8 days |
Total fair value of shares vested |  |  | $ 535 | $ 398
Weighted average estimated fair value of shares granted (in dollars per share) | $ 2.12 | $ 3.18 | $ 2.12 | $ 3.18
Restricted Stock Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized compensation cost | $ 221 |  | $ 221 |
Expected weighted-average period in years of compensation cost to be recognized |  |  | 1 year 8 months 1 day |
Restricted Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized compensation cost | 76 |  | $ 76 |
Expected weighted-average period in years of compensation cost to be recognized |  |  | 3 months |
Research and development |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation expense | 58 | $ 54 | $ 240 | $ 229
General and administrative |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation expense | $ 171 | $ 200 | $ 850 | $ 818

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