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Prepaid Expenses and Other Current Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]
Prepaid insurance	$ 979	$ 856
Prepaid research and development	2,721	4,771
Other prepaid expenses	710	528
Other current assets	311	247
Total prepaid expenses and other current assets	$ 4,721	$ 6,402

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