Accrued Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Accrued Liabilities, Current [Abstract]
Contract research organization costs	$ 38,349	$ 31,646
Other clinical study related costs	3,957	3,901
Compensation and benefits	6,769	4,686
Professional fees	2,455	830
Other	3,518	4,159
Total accrued liabilities	$ 55,048	$ 45,222

Amount of expenses incurred but not yet paid classified as other, due within one year or the normal operating cycle, if longer.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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