Share-based compensation - Costs (Details) - USD ($) |
1 Months Ended | 3 Months Ended | 9 Months Ended | |||
---|---|---|---|---|---|---|
Sep. 30, 2020 |
Aug. 31, 2020 |
Sep. 30, 2020 |
Sep. 30, 2019 |
Sep. 30, 2020 |
Sep. 30, 2019 |
|
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||
Stock-based compensation expense | $ 800,000 | $ 0 | $ 117,000 | $ 1,000 | $ 302,000 | $ 11,000 |
Unrecognized compensation cost | $ 1,500,000 | 1,500,000 | $ 1,500,000 | |||
Recognition period | 2 years 9 months 25 days | |||||
Research and development | ||||||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||
Stock-based compensation expense | 78,000 | $ 1,000 | $ 208,000 | 5,000 | ||
General and administrative | ||||||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||
Stock-based compensation expense | $ 39,000 | $ 94,000 | $ 6,000 |