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Marketable Securities and Fair Value Measurements - Summary of marketable securities (Detail) - Fair Value, Recurring [Member] - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Marketable Securities [Line Items]
Amortized cost		$ 199,429
Gross unrealized gain		13
Gross unrealized losses		(4)
Estimated fair value		199,438
U.S. treasury securities
Marketable Securities [Line Items]
Amortized cost	$ 33,117	129,446
Gross unrealized gain	4	9
Gross unrealized losses		(4)
Estimated fair value	$ 33,121	129,451
Commercial paper
Marketable Securities [Line Items]
Amortized cost		52,441
Estimated fair value		52,441
Corporate debt securities
Marketable Securities [Line Items]
Amortized cost		17,542
Gross unrealized gain		4
Estimated fair value		$ 17,546

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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