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Summary of Significant Accounting Policies - Summary of reconciliation of cash and cash equivalents and restricted cash reported within the condensed balance sheets (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Cash and cash equivalents	$ 374,205	$ 386,569
Restricted cash	350	350
Total cash and cash equivalents and restricted cash	374,555	386,919	$ 24,180	$ 10,526
Restricted Cash [Member]
Cash and cash equivalents	374,205	386,569
Restricted cash	350	350
Total cash and cash equivalents and restricted cash	$ 374,555	$ 386,919

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of cash restricted as to withdrawal or usage, classified as noncurrent. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.

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