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Share-Based Compensation - Schedule of expense related to stock options (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Total $ 321 $ 6 $ 344 $ 13
Share-Based Compensation Expense        
Unrecognized stock based compensation 9,400   $ 9,400  
Unrecognized stock-based compensation weighted-average period     3 years 8 months 12 days  
Research and development        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Total 101 2 $ 113 2
General and administrative        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Total $ 220 $ 4 $ 231 $ 11