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Accrued Expenses - Schedule of Accrued Expenses (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Payables And Accruals [Abstract] |  |
Employees benefits | $ 457 | $ 496
Professional services | 107 | 292
Legal fees | 144 | 133
Royalty fees | 3 | 12
Severance | 139 | 347
Other | 23 | 57
Total | $ 873 | $ 1,337

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