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Accrued Expenses - Components of Accrued Expenses (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Payables And Accruals [Abstract]    
Compensation and benefits $ 605 $ 1,759
Research and development expenses 26 249
Legal and professional fees 507 417
Sales taxes   554
Other 220 143
Total accrued expenses $ 1,358 $ 3,122