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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
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

X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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-Paragraph 2
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- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
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