Marketable Securities - Additional Information (Detail) - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Investments Debt And Equity Securities [Abstract]
Cash and cash equivalent, Amortized cost	$ 56,700,000	$ 24,700,000
Cash, cash equivalents and marketable securities	56,700,000	24,700,000
Credit losses related to the cash equivalents or marketable securities	$ 0	$ 0