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Accrued expenses and other current liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Accrued expenses and other current liabilities    
Accrued external research and development expenses $ 3,923 $ 8,740
Accrued employee compensation and benefits 965 495
Accrued legal and professional fees 306 154
Short-term lease liability and other 337 294
Total accrued expenses and other current liabilities $ 5,531 $ 9,683