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Accrued Expenses - Components of Accrued Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Payables And Accruals [Abstract]    
Compensation and benefits $ 976 $ 1,759
Research and development expenses 212 249
Legal and professional fees 326 417
Use taxes   554
Other 57 143
Total accrued expenses $ 1,571 $ 3,122