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Marketable Securities and Fair Value Measurements - Summary of assets measured at fair value on a recurring basis (Detail) - Fair Value, Recurring [Member] - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
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Cash equivalents: |  |
Totals |  | $ 263,265
Marketable securities: |  |
Marketable securities |  | 199,438
Level 1 |  |
Cash equivalents: |  |
Totals |  | 63,827
Level 2 |  |
Cash equivalents: |  |
Totals |  | 199,438
Money Market Funds |  |
Cash equivalents: |  |
Cash equivalents | $ 226,378 | 63,827
Money Market Funds | Level 1 |  |
Cash equivalents: |  |
Cash equivalents | 226,378 | 63,827
U.S. treasury securities |  |
Marketable securities: |  |
Marketable securities | 33,121 | 129,451
U.S. treasury securities | Level 2 |  |
Marketable securities: |  |
Marketable securities | $ 33,121 | 129,451
Commercial paper |  |
Marketable securities: |  |
Marketable securities |  | 52,441
Commercial paper | Level 2 |  |
Marketable securities: |  |
Marketable securities |  | 52,441
Corporate debt securities |  |
Marketable securities: |  |
Marketable securities |  | 17,546
Corporate debt securities | Level 2 |  |
Marketable securities: |  |
Marketable securities |  | $ 17,546

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- Definition Fair value portion 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. + References No definition available. + Details
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