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Organization, Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Accounting Policies [Abstract]
Research and development costs	$ 2,195	$ 2,800
Refundable contract liability	836	836
Compensation and benefit costs	499	1,492
Accrued professional fees	514	2,185
Accrued development milestone		1,531
Other	83	162
Total accrued expenses and other current liabilities	$ 4,127	$ 9,006

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for professional fees, such as for legal and accounting services received. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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