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Accrued Liabilities - Schedule of Accrued Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Accrued Liabilities, Current [Abstract]      
Research and development accrued expenses $ 12,129 $ 6,626 $ 2,060
Accrued offering costs 0 1,301 576
Accrued bonus 793 3,429 1,113
Accrued vacation   344 249
Other liabilities 1,478 1,824  
Other liabilities   1,480 578
Total accrued liabilities $ 14,400 $ 13,180 $ 4,576