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Selected Balance Sheet Information - Schedule of Prepaid expenses and other current assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Selected Balance Sheet Information    
Receivable from prior owner $ 1,594 $ 0
Prepaid insurance 557 803
Prepaid clinical research organizations 266 458
Prepaid consulting, subscriptions and other expenses 217 272
VAT receivable 127 0
Prepaid manufacturing expenses 102 0
Total $ 2,863 $ 1,533