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Fair Value Measurement - Summary of Contractual Maturities of Available for Sale Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Schedule Of Available For Sale Securities [Line Items]
Available for sale securities, contractual maturities less than 1 year	$ 138,534	$ 94,570
Available for sale securities, contractual maturities between 1 to 5 years	81,754	133,235
Available for sale securities, contractual maturities between 5 to 10 years	56,462	53,600
Available for sale securities, contractual maturities after 10 years	36,793	13,988
Available for sale securities, contractual maturities, Total	313,543	295,393
Corporate Bonds [Member]
Schedule Of Available For Sale Securities [Line Items]
Available for sale securities, contractual maturities less than 1 year	49,308	7,238
Available for sale securities, contractual maturities between 1 to 5 years	61,315	120,887
Available for sale securities, contractual maturities between 5 to 10 years	34,172	25,936
Available for sale securities, contractual maturities, Total	144,795	154,061
U.S. Treasuries [Member]
Schedule Of Available For Sale Securities [Line Items]
Available for sale securities, contractual maturities less than 1 year	1,367	20,632
Available for sale securities, contractual maturities between 1 to 5 years	1,504	804
Available for sale securities, contractual maturities between 5 to 10 years	1,620
Available for sale securities, contractual maturities, Total	4,491	21,436
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	2,128
Available for sale securities, contractual maturities between 1 to 5 years	18,668	6,425
Available for sale securities, contractual maturities between 5 to 10 years	20,670	27,664
Available for sale securities, contractual maturities, Total	40,351	36,217
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 between 1 to 5 years		4,800
Available for sale securities, contractual maturities, Total	4,778	4,800
Money Market Funds [Member]
Schedule Of Available For Sale Securities [Line Items]
Available for sale securities, contractual maturities less than 1 year	82,066	64,572
Available for sale securities, contractual maturities, Total	82,066	64,572
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	267	319
Available for sale securities, contractual maturities after 10 years	36,793	13,988
Available for sale securities, contractual maturities, Total	$ 37,062	$ 14,307

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