Annual report pursuant to Section 13 and 15(d)

Supplemental Balance Sheet Information, Accrued Expenses (Details)

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Supplemental Balance Sheet Information, Accrued Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Accrued Expenses [Abstract]    
R&D services and supplies $ 1,081 $ 1,440
Payroll 488 320
Professional services 84 186
Other 80 25
Total $ 1,733 $ 1,971