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Selected Balance Sheet Information - Schedule of Prepaid expenses and other current assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Selected Balance Sheet Information    
Prepaid clinical research organizations $ 1,190 $ 2,293
Prepaid manufacturing expenses 501 418
Prepaid consulting, subscriptions and other expenses 227 155
Prepaid insurance 114 637
VAT receivable 176 87
Receivable from Grifols 0 144
Total $ 2,208 $ 3,734