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Accrued Expenses - Components of Accrued Expenses (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Payables And Accruals [Abstract]    
Compensation and benefits $ 455 $ 1,759
Research and development expenses 223 249
Legal and professional fees 957 417
Sales taxes   554
Other 939 143
Total accrued expenses $ 2,574 $ 3,122