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Fair Value Measurement - Summary of Contractual Maturities of Available for Sale Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Schedule Of Available For Sale Securities [Line Items]
Available for sale securities, contractual maturities less than 1 year	$ 94,570	$ 24,389
Available for sale securities, contractual maturities between 1 to 5 years	133,235	196,990
Available for sale securities, contractual maturities between 5 to 10 years	53,600	55,605
Available for sale securities, contractual maturities after 10 years	13,988
Available for sale securities, contractual maturities, Total	295,393	276,984
Corporate Bonds [Member]
Schedule Of Available For Sale Securities [Line Items]
Available for sale securities, contractual maturities less than 1 year	7,238	14,183
Available for sale securities, contractual maturities between 1 to 5 years	120,887	144,894
Available for sale securities, contractual maturities between 5 to 10 years	25,936	22,735
Available for sale securities, contractual maturities, Total	154,061	181,812
U.S. Treasuries [Member]
Schedule Of Available For Sale Securities [Line Items]
Available for sale securities, contractual maturities less than 1 year	20,632	4,919
Available for sale securities, contractual maturities between 1 to 5 years	804	40,240
Available for sale securities, contractual maturities, Total	21,436	45,159
U.S. Government Agency Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Available for sale securities, contractual maturities less than 1 year	2,128	4,788
Available for sale securities, contractual maturities between 1 to 5 years	6,425	7,031
Available for sale securities, contractual maturities between 5 to 10 years	27,664	32,870
Available for sale securities, contractual maturities, Total	36,217	44,689
Supranational Bonds [Member]
Schedule Of Available For Sale Securities [Line Items]
Available for sale securities, contractual maturities between 1 to 5 years	4,800	4,741
Available for sale securities, contractual maturities, Total	4,800	4,741
Money Market Funds [Member]
Schedule Of Available For Sale Securities [Line Items]
Available for sale securities, contractual maturities less than 1 year	64,572	449
Available for sale securities, contractual maturities, Total	64,572	449
Asset Backed Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Available for sale securities, contractual maturities between 1 to 5 years	319	84
Available for sale securities, contractual maturities after 10 years	13,988
Available for sale securities, contractual maturities, Total	$ 14,307	84
Municipal Bonds [Member]
Schedule Of Available For Sale Securities [Line Items]
Available for sale securities, contractual maturities less than 1 year		50
Available for sale securities, contractual maturities, Total		$ 50

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