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Investments - Summary of Fair Value of Available-for-Sale Investments by Type of Security (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Schedule Of Held To Maturity Securities [Line Items]
Amortized Cost	$ 230,351
Unrealized Gains	64
Fair Value	230,415
Investments with a maturity of one year or less [Member]
Schedule Of Held To Maturity Securities [Line Items]
Amortized Cost	50,993	$ 313,537
Unrealized Gains	26	325
Fair Value	51,019	313,862
Investments with a maturity of one to two years [Member]
Schedule Of Held To Maturity Securities [Line Items]
Amortized Cost	179,358
Unrealized Gains	38
Fair Value	179,396
U.S treasury bills [Member] | Investments with a maturity of one year or less [Member]
Schedule Of Held To Maturity Securities [Line Items]
Amortized Cost	29,997	232,336
Unrealized Gains	21	268
Fair Value	30,018	232,604
U.S treasury bills [Member] | Investments with a maturity of one to two years [Member]
Schedule Of Held To Maturity Securities [Line Items]
Amortized Cost	3,008
Fair Value	3,008
U.S agency securities [Member] | Investments with a maturity of one year or less [Member]
Schedule Of Held To Maturity Securities [Line Items]
Amortized Cost	20,996	81,201
Unrealized Gains	5	57
Fair Value	21,001	$ 81,258
U.S agency securities [Member] | Investments with a maturity of one to two years [Member]
Schedule Of Held To Maturity Securities [Line Items]
Amortized Cost	176,350
Unrealized Gains	38
Fair Value	$ 176,388

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- 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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+ References

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