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Fair Value Measurement - Summary of Contractual Maturities of Available for Sale Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Schedule Of Available For Sale Securities [Line Items]
Available for sale securities, contractual maturities less than 1 year	$ 34,004	$ 138,534
Available for sale securities, contractual maturities between 1 to 5 years	74,009	81,754
Available for sale securities, contractual maturities between 5 to 10 years	186,252	56,462
Available for sale securities, contractual maturities after 10 years	31,321	36,793
Available for sale securities, contractual maturities, Total	325,586	313,543
Corporate Bonds [Member]
Schedule Of Available For Sale Securities [Line Items]
Available for sale securities, contractual maturities less than 1 year	22,114	49,308
Available for sale securities, contractual maturities between 1 to 5 years	48,127	61,315
Available for sale securities, contractual maturities between 5 to 10 years	100,345	34,172
Available for sale securities, contractual maturities, Total	170,586	144,795
Money Market Funds [Member]
Schedule Of Available For Sale Securities [Line Items]
Available for sale securities, contractual maturities less than 1 year	10,885	82,066
Available for sale securities, contractual maturities, Total	10,885	82,066
U.S. Government Agency Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Available for sale securities, contractual maturities less than 1 year		1,013
Available for sale securities, contractual maturities between 1 to 5 years	23,742	18,668
Available for sale securities, contractual maturities between 5 to 10 years	18,823	20,670
Available for sale securities, contractual maturities, Total	42,565	40,351
Asset Backed Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Available for sale securities, contractual maturities less than 1 year		2
Available for sale securities, contractual maturities between 1 to 5 years	153	267
Available for sale securities, contractual maturities between 5 to 10 years	2,200
Available for sale securities, contractual maturities after 10 years	31,321	36,793
Available for sale securities, contractual maturities, Total	33,674	37,062
U.S. Treasuries [Member]
Schedule Of Available For Sale Securities [Line Items]
Available for sale securities, contractual maturities less than 1 year	1,005	1,367
Available for sale securities, contractual maturities between 1 to 5 years	1,987	1,504
Available for sale securities, contractual maturities between 5 to 10 years	64,884	1,620
Available for sale securities, contractual maturities, Total	$ 67,876	4,491
Supranational Bonds [Member]
Schedule Of Available For Sale Securities [Line Items]
Available for sale securities, contractual maturities less than 1 year		4,778
Available for sale securities, contractual maturities, Total		$ 4,778

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