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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
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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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